This files contains all 3 bursts: GRB 041219A, GRB 041219B, GRB 041219C //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2865 SUBJECT: GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger DATE: 04/12/19 02:35:52 GMT FROM: Josh Bloom at Harvard/CFA GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger J. S. Bloom (CfA/UCB) reports on behalf of a larger group: "Responding to the IBAS Alert #2073, we imaged the field of the (possible) GRB 041219 starting at 19 Dec 2004 01h49m18 UT, about 2.8 minutes after the GRB (imaging is on-going). A quick comparison with the 2MASS Quicklook J-band images reveals no obvious new source. The imaging depth is deeper than 2MASS. A more detailed analysis is on-going." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2866 SUBJECT: GRB 041219 - A long GRB detected by INTEGRAL DATE: 04/12/19 03:31:58 GMT FROM: Sandro Mereghetti at IASF/CNR D. Gotz, S. Mereghetti (IASF, Milano), S.Shaw, M. Beck (ISDC, Versoix), J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A very long (about 9 minutes ) and bright GRB has been detected with the INTEGRAL Burst Alert System (IBAS) on December 19 at 01:43 UT. The GRB has been detected with IBIS/ISGRI in the 15-200 keV band (IBAS Alert # 2073). Its coordinates (J2000) are: RA: 6.1075 [degrees] DEC: +62.8349 [degrees] with an uncertainty of 2 arcmin (90% c.l. radius) The brightest part of the burst saturated the available telemetry. Therefore at the moment we can only estimate a lower limit to the peak flux in the 20-200 keV range. This is about 12 photons/cmsq/s (1E-6 erg/cmsq/s) (1 s integration time). This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2867 SUBJECT: GRB041219: P60 Optical Observations DATE: 04/12/19 03:55:23 GMT FROM: S. Bradley Cenko at Caltech S. Bradley Cenko reports on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We have imaged the 2.5-arcmin radius error circle of the Integral GRB 041219 with the robotic Palomar 60-inch telescope. Observations consisted of 19 x 120-second exposures in the Kron I filter, commencing at 02:05:09 UT (~ 22 minutes after the burst). To a limiting magnitude of I ~ 20 we detect no new objects by reference to the Digitized Sky Survey (second epoch). Continued analysis and further observations are planned." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2868 SUBJECT: GRB041219: Prompt Optical Observations from ROTSE-IIIb DATE: 04/12/19 04:11:28 GMT FROM: Eli Rykoff at Univ. of Michigan/ROTSE E. Rykoff (U. Michigan) and R. Quimby (U. Texas) report on behalf of the ROTSE collaboration: ROTSE-IIIb, located at McDonald Observatory, Texas, responded automatically to INTEGRAL trigger #2073, GRB041219. Our first 5-s exposure started at 01:44:11.6 UT, 74 seconds after the start of the GRB, and 6 seconds after the trigger, and during the GRB itself (GCN 2866). Our unfiltered images were calibrated relative to USNO A2.0. Comparison to DSS reveals no new sources to a limiting magnitude of around 17.2. Due to the low galactic latitude, field crowding is a significant issue. Imaging is ongoing. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2870 SUBJECT: GRB 041219: Infrared Afterglow Candidate DATE: 04/12/19 04:43:31 GMT FROM: Josh Bloom at Harvard/CFA GRB 041219: Infrared Afterglow Candidate C. Blake (CfA) and J. S. Bloom (CfA/UCB) report on behalf of a larger group: "PAIRITEL continued to image the field of GRB 041219 (GCN #2866) starting from 19 Dec 2004 01h49m18 UT, about 2.8 minutes after the GRB (see GCN #2865). That first epoch of imaging had a total integration time of 533 sec. A second epoch of image began at 02h46m59 UT (502 sec total integration). A comparison with the 2MASS Quicklook and Atlas K-band images reveals a new point source at RA 00h24m27.6s, DEC +62d50m32.9s (J2000). By comparison to nearby 2MASS stars we estimate a magnitude of K~15.5 in the first epoch. The object is also detected in J-band near the detection limit (ie. it appears to be heavily reddened) and appears to have faded between the two epochs. Observations have ceased due to high winds." A finding chart will be posted shortly at: http://pairitel.org/grb041219.gif This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2871 SUBJECT: GRB041219, BVRcIc field calibration DATE: 04/12/19 04:59:33 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired BVRcIc all-sky photometry for a 11x11 arcmin field centered on the coordinates for the INTEGRAL burst GRB041219 (Gotz et al., GCN 2866) with the USNOFS 1.0-m telescope on one marginally photometric night. Stars brighter than V=13.0 are saturated and should be used with care. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb041219.dat The astrometry in this file is based on linear plate solutions with respect to USNOA2. The external errors are less than 300mas. The estimated external photometric error is about 0.04mag due to the poor seeing. As always, you should check the dates on the .dat file prior to final publication to get the latest photometry. There is a README file on the ftp directory to give you information about the procedures used to calibrate these fields. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2872 SUBJECT: GRB 041219: Infrared Afterglow Candidate DATE: 04/12/19 05:16:10 GMT FROM: Josh Bloom at Harvard/CFA GRB 041219: Infrared Afterglow Candidate C. Blake (CfA) and J. S. Bloom (CfA/UCB) report on behalf of a larger group: "PAIRITEL continued to image the field of GRB 041219 (GCN #2866) starting from 19 Dec 2004 01h49m18 UT, about 2.8 minutes after the GRB (see GCN #2865). That first epoch of imaging had a total integration time of 533 sec. A second epoch of image began at 02h46m59 UT (502 sec total integration). A comparison with the 2MASS Quicklook and Atlas K-band images reveals a new point source at RA 00h24m27.6s, DEC +62d50m32.9s (J2000). By comparison to nearby 2MASS stars we estimate a magnitude of K~15.5 in the first epoch. The object is also detected in J-band near the detection limit (ie. it appears to be heavily reddened) and appears to have faded between the two epochs. Observations have ceased due to high winds." A finding chart will be posted shortly at: http://pairitel.org/grb041219.gif This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2874 SUBJECT: Swift-BAT detection of the bright long burst GRB041219 DATE: 04/12/19 06:33:02 GMT FROM: Scott Barthelmy at NASA/GSFC S. Barthelmy (GSFC), D. Burrows (PSU), J. Cummings (GSFC), E. Fenimore (LANL), N. Gehrels (GSFC), M. Goad (U.Leicester), D. Hullinger (UMD), H. Krimm (USRA), C. Markwardt (UMD), F. Marshall (GSFC), K. McLean (LANL), J. Nousek (PSU), J. Osborne (U.Leicester), D. Palmer (LANL), A. Parsons (GSFC), G. Sato (ISAS), M. Suzuki (Saitama), G. Tagliaferri (OAB), J. Tueller (GSFC) on behalf of the Swift BAT team. At 01:42:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located on-board GRB041219 (GCN Circ# 2866, D.Gotz et al.). The spacecraft did not autonomously slew to the burst since automated slewing is not yet enabled. The BAT ground-calculated location is RA,Dec 6.154,+62.847 (J2000) with an uncertainty of 12 arcmin (radius, including a large systematic uncertainty due to the lack of an on-orbit bore-sight alignment calibration). This is ~11 degrees off the BAT bore sight and is in the fully encoded field of view. This position is consistant with the INTEGRAL position (GCN Circ# 2866), and is within 4.1 arcmin of the BAT on-board location (14 sec after the initial rate trigger). We note that this position is in the Galactic plane with a Galactic Lon,Lat of 120,+0.1deg. The burst lightcurve is multi-peaked with structure within the peaks. After an initial pair of small precursors, the peak intensity increased to 25 events/cm^2/sec (1-sec sampling; unsaturated; ~15 to 200 keV; 43 Crab) 300 sec after the initial triggering peak. The total duration was 520 sec. The fluence is ~1e-4 erg/cm^2. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2876 SUBJECT: GRB041219: Confirmed NIR Afterglow DATE: 04/12/19 17:45:16 GMT FROM: S. Bradley Cenko at Caltech Dae-Sik Moon, S. Bradley Cenko (Caltech), and Joe Adams (Cornell) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We have imaged the field of GRB041219 with the Wide Field Infrared Camera (WIRC) on the Palomar 200-inch Hale Telescope. We can confirm the presence of a fading source at the position reported by Blake and Bloom (GCN 2870). Our K_s magnitudes (with reference to the 2MASS catalog) are as follows: UT (Dec 19) t_burst K_s Magnitude ---------------------------------------------------- 02:31:52 0.8 h 14.9 03:16:01 1.55 h 15.5 This corresponds to a decay index of ~ 0.8" //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2881 SUBJECT: GRB 041219: Radio Afterglow Detection DATE: 04/12/20 05:50:16 GMT FROM: Alicia Soderberg at Caltech A. M. Soderberg (Caltech) and D. A. Frail (NRAO) report on behalf of the Caltech/NRAO/Carnegie GRB Collaboration: "We observed the field of GRB 041219 (GCN #2866) with the Very Large Array on 2004 Dec 20.14 UT (t ~ 1.1 days after the burst). At 8.5 GHz we detect a radio source coincident with the optical afterglow reported by Blake & Bloom (GCN #2870) with a flux density of 0.45 +- 0.05 mJy. Further observations are planned." ----------------------------------------------------------------- Alicia M. Soderberg Office: 626.395.4095 Caltech Astronomy Mobile: 626.676.4723 MS 105-24 FAX: 626.568-9352 1201 E. California Blvd. Email: ams@astro.caltech.edu Pasadena, CA 91125 http://www.astro.caltech.edu/~ams ----------------------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2882 SUBJECT: GRB 041219 ,optical observation DATE: 04/12/20 06:59:00 GMT FROM: Eri Sonoda at U of Miyazaki/Japan E.Sonoda,S.Maeno,Y.Matsuo, M.Yamauchi (University of Miyazaki) "We have observed the field covering the error box of GRB 041219 (INTEGRAL trigger 2073; trigger time 01:42:54.79 UT) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 11:17:21 UT on Dec.19. Observed field of view is 43 arcmin centerd on R.A=00h 23m 41.32s Dec=+62d 54m 13.0s After co-adding a set of 5 images of 30 sec exposures , we have compared with the USNO A2.0 catalog . Preliminary analysis shows there is no new source brighter than 18.5 mag. at the position reported by C.Blake et.al.(GCN2872)." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2883 SUBJECT: GRB041219b: A Swift-BAT burst DATE: 04/12/20 07:37:08 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. Cummings, L. Barbier, S. Barthelmy (GSFC), M. Chester (PSU), E. Fenimore (LANL), N. Gehrels (GSFC), P. Giommi (ASDC), M. Goad (U.Leicester), D. Hullinger (UMD), K. Hurley (UCB), H. Krimm (USRA), C. Markwardt (UMD), K. McLean (LANL), D. Palmer (LANL), A. Parsons (GSFC), G. Sato (ISAS), M. Suzuki (Saitama), J. Tueller (GSFC) on behalf of the Swift BAT team. At 15:38:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located on-board GRB041219b. The spacecraft did not autonomously slew to the burst since automated slewing is not yet enabled. Automated notification through TDRSS is also disabled during this early commissioning phase of the mission. The ground-calculated location is RA,Dec 167.674,-33.458 (J2000) with an uncertainty of 12 arcmin (radius, including a large systematic uncertainty due to the lack of an on-orbit bore-sight alignment calibration). This is ~25 degrees off the BAT bore sight and is ~90% encoded. It was a 82 sigma detection. The burst lightcurve has one strong peak (width ~5 sec) of 10 events/cm^2/sec in the ~15 to 200 keV band. It is preceded by one small peak and followed by two small peaks. The total duration was 30 sec. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2884 SUBJECT: GRB041219: Continued NIR Observations DATE: 04/12/20 08:24:16 GMT FROM: S. Bradley Cenko at Caltech Dae-Sik Moon, S. Bradley Cenko (Caltech) and Joe Adams (Cornell) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We have continued to image the NIR afterglow of GRB041219 (Blake and Bloom, GCN 2870) with the Wide Field Infrared Camera (WIRC) on the Palomar 200-inch Hale Telescope. Our latest observations in the K_s band, taken at a mean time of 01:58:00 UT (1.01 days after the burst), put the object at a magnitude of 16.5 (with reference to the 2MASS catalog). This is a significantly shallower decay than we reported for the early afterglow (GCN 2876). Further observations are planned." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2885 SUBJECT: GRB041219: Optical Afterglow Detection DATE: 04/12/20 09:29:25 GMT FROM: S. Bradley Cenko at Caltech S. Bradley Cenko reports on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We have imaged the position of the NIR afterglow of GRB041219 (Blake and Bloom, GCN 2870) with the robotic Palomar 60-inch telescope. We detect the presence of a faint source at this position, with a z-band magnitude of 21.0 +/- 0.3. The mean epoch of our observations is approximately 04:57 UT, December 20. Further observations are planned." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2886 SUBJECT: GRB041219c: Third Burst in One Day from Swift-BAT DATE: 04/12/20 18:22:19 GMT FROM: Craig Markwardt at GSFC C. Markwardt (UMD), L. Barbier, S. Barthelmy (GSFC), P. Boyd (UMBC), S. Campana (OAB), J. Cummings (GSFC), E. Fenimore (LANL), M. Galassi (LANL), N. Gehrels (GSFC), M. Goad (U.Leicester), D. Hullinger (UMD), H. Krimm (USRA), K. McLean (LANL), J. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC), G. Sato (ISAS), M. Suzuki (Saitama), T. Takahashi (ISAS), J. Tueller (GSFC) on behalf of the Swift BAT team. At 20:30:33 UT, the Swift Burst Alert Telescope (BAT) triggered and located on-board GRB041219c (BAT Trigger #100380). This is the third burst detected and imaged by BAT on Dec 19. The spacecraft did not autonomously slew to the burst since automated slewing is not yet enabled. Automated notification through TDRSS is also disabled during this early commissioning phase of the mission. The ground-calculated location is RA, Decl. 343.966, -76.802 (J2000) with an uncertainty of 12 arcmin (radius, including a large systematic uncertainty due to the lack of an on-orbit bore-sight alignment calibration). This is ~43 degrees off the BAT bore sight and is ~50% encoded. It was imaged at >19 sigma. The source is 39 degrees from the galactic plane. The burst contained at least two peaks, each peak with a full-width, half-maximum of ~7 seconds, for a total duration of ~40 seconds. There is a possible faint precursor 40 seconds earlier which may or may not be from GRB 041219c (it cannot be determined with the data at hand). The peak flux was 1.5 events/cm^2/sec in the 15-350 keV band (~6 Crab). The spectrum appears to be soft based on the light curve. The total fluence is approximately 21 events/cm^2 (15-350 keV), or 2E-6 erg/cm^2. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2887 SUBJECT: GRB 041219 Optical Observations DATE: 04/12/20 19:10:03 GMT FROM: Shashi Bhushan Pandey at State Obs.Nainital,India S. B. Pandey and Kuntal Misra (ARIES NainiTal), on behalf of larger Indian GRB collaboration We observed INTEGRAL/Swift GRB 041219 localization by Gotz et al. (GCN 2866) with 1.04m telescope at ARIES NainiTal. In a single 900 sec R_c band frame, we did not detect the optical afterglow at the IR afterglow position of the source by Blake & Bloom (GCN 2870). We put an upper limit ~ 21 mag, around 13 hours after the burst. This massage may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2889 SUBJECT: Deep RAPTOR observations during GRB 041219 DATE: 04/12/20 20:11:31 GMT FROM: James Wren at LANL J. Wren, W. T. Vestrand, S. Evans, R. White, and P. Wozniak report on behalf of the RAPTOR team at Los Alamos National Lab. The RAPTOR-S telescope responded robotically to INTEGRAL trigger #2073. Our first image began at 01:44:13.65 UT, 8 seconds after receipt of the Integral notice and while the GRB was still ongoing. Summing our images over the duration of the GRB emission (1:44 UT to 1:52 UT), we marginally detect a possible source very close to our threshold at the location of the candidate given by Blake and Bloom (GCN 2870). Interpreted as an upper limit, these observations indicate the prompt optical emission remained fainter than R=19.4. A RAPTOR finder chart can be found at http://www.raptor.lanl.gov/grb041219/. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2891 SUBJECT: GRB 041219 : optical follow-up observations DATE: 04/12/21 06:18:21 GMT FROM: Kuiyun Huang at IANCU GRB 041219 : optical follow-up observations C.W. Chen (NCU), H.C. Lin (NCU), C.L. Lu (BAO) K.Y. Huang (NCU), Y. Qiu (BAO), Y. Urata (RIKEN), Y.Q. Lou(THCA) on behalf of the East Asian collaboration report: " We have observed the position of infrared afterglow candidate reported by Blake et al. (GCN 2870) at Lulin (Taiwan, 1-m telescope) and XingLong (China, 0.8 m telescope) Observatory. The R band observations are summarized as below: Start Time (UTC) Filter Exposure (sec) Limit mag. Site (SN=3) Dec. 9.47 R 300 x 2 + 600 x 2 >~ 21 Lulin Dec. 9.48 R 300 x 1 + 360 x 1 >~ 20 XingLong Limiting magnitudes were estimated by comparison with several USNO-B1.0 stars. The candidate was not detected brighter than the limiting magnitudes." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2893 SUBJECT: GRB 041219: Keck IR Observations and Astrometric Refinement of the DATE: 04/12/21 08:32:22 GMT FROM: Josh Bloom at Harvard/CFA GRB 041219: Keck IR Observations and Astrometric Refinement of the IR Flash J. S. Bloom (CfA/UCB), J. X. Prochaska (UCSC), C. McCabe (UCLA), A. Ghez (UCLA), K. Stapelfeldt (JPL), G. Duchene (Grenoble), Q. Konopacky (UCLA), K. Hurley (UCB/SSL), C. Blake (CfA), D. Starr (Gemini) report: Comparing the IR flash discovery images (GCN #2870) of GRB 041219 (GCN #2866; #2874) to 25 stars in the 2MASS catalogue, we find a refined absolute astrometric position of the IR flash to be (J2000): RA = 00:24:27.68 (+/- 0.124"), Dec = +62:50:33.501 (+/- 0.228") This is 4.310" East and 8.415" North from a nearby brighter point source. In J-band imaging (though clouds) with NIRC on the Keck I 10-m telescope on Mauna Kea, HI, the IR transient (IRT) was detected on 20.25 December 2004 UT, significantly faded from the first night of PAIRITEL imaging. In 0.7" seeing, the IRT appears point-like; that is, there is no indication yet for the presence of an underlying host galaxy. We note that the IRT is located 2.5 arcsec south-south-west of a faint compact source." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2894 SUBJECT: GRB 041219: WSRT Radio Afterglow Detection DATE: 04/12/21 13:41:10 GMT FROM: Alexander van der Horst at U of Amsterdam A.J. van der Horst (University of Amsterdam), E. Rol (University of Leicester) and R. Strom (ASTRON, University of Amsterdam) report on behalf of a larger collaboration: "We observed the INTEGRAL GRB 041219 (GCN 2866) at 4.9 GHz with the Westerbork Synthesis Radio Telescope on December 20 from 15.55 to 23.59 UT, i.e. 1.59 - 1.93 days after the burst. We detect a radio source at the position of the infrared afterglow reported by Bloom et al. (GCN 2893) with an average flux density of 205 +/- 20 microJy, and a probable increase in the flux density during the observation. This measurement is in agreement with the radio detection at 8.5 GHz reported by Soderberg & Frail (GCN 2881). Further observations are planned." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2895 SUBJECT: GRB 041219: Second Epoch WSRT Radio Observations DATE: 04/12/22 16:41:00 GMT FROM: Alexander van der Horst at U of Amsterdam A.J. van der Horst (University of Amsterdam), E. Rol (University of Leicester) and R. Strom (ASTRON, University of Amsterdam) report on behalf of a larger collaboration: "We reobserved the INTEGRAL GRB 041219 (GCN 2866) at 4.9 GHz with the Westerbork Synthesis Radio Telescope on December 21 from 14.45 to 23.55 UT, i.e. 2.54 - 2.93 days after the burst. Compared to our previous measurement (GCN 2894), the average flux density has increased to 349 +/- 22 microJy. Assuming a power law behaviour, the average temporal index at 4.9 GHz between this and our previous observation is alpha ~ 1.2. Further observations are planned." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2900 SUBJECT: GRB 041219c: PROMPT Observations DATE: 04/12/23 23:25:48 GMT FROM: Melissa Nysewander at UNC,Chapel Hill Melissa Nysewander, Matt Bayliss, Andrew Foster, and Dan Reichart report on behalf of the U. North Carolina team of the FUN GRB Collaboration: We imaged an 11.7 arcmin x 11.7 arcmin field near the center of the localization of GRB 041219c (Markwardt et al., GCN 2886) for 70 x 60 sec in V beginning 29.0 hours after the burst with PROMPT Telescope 3 at CTIO. Visual comparison to POSS2-Red reveals no obvious transients. Calibration to 10 NOMAD-V stars yields a 3-sigma limiting magnitude of V = 20.4 at a mean time of 30.0 hours after the burst for this region. Our image can be found at: http://www.physics.unc.edu/~mnysewan/grb041219c.html Construction and commissioning of PROMPT Telescope 3 began only three days prior to this burst. Despite this, the observations were conducted completely remotely from La Serena. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2905 SUBJECT: GRB 041219: TAROT optical observations DATE: 04/12/24 14:14:43 GMT FROM: Michel Boer at Obs Haute Prov. Klotz, A., Boer M. (OHP), Atteia, J.L., and G. Stratta (LATT) report The field of GRB 041219 (Mereghetti, et al., GCNC 2866) was observed with the robotic 25 cm TAROT telescope at Calern, France. The observation started 25 seconds after the GCN notice without filter. The field was only 28 degrees above horizon. We co-added 12 frames of 30s from 01:45:30 to 01:54:05 UT, i.e. while the GRB prompt emission was still active. The associated OT described by Blake & Bloom (GCNC 2870) is not detected at the limiting magnitude of the image R > 18.5. We analyzed the 2MASS catalog to extract the galactic extinction through the line of sight of GRB041219. We used the method described in Klotz et al. (A&A 2004, vol 425, p427). From Earth to a distance modulus of about 10.5, the visual extinction is Av=1.12. The 2MASS data don't allow probing farer distances. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2906 SUBJECT: Swift-BAT Time History of GRB041219 DATE: 04/12/24 14:58:45 GMT FROM: Ed Fenimore at LANL E. Fenimore (LANL), S. Barthelmy (GSFC), J. Cummings (GSFC), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (UMD), K. McLean (LANL), D. Palmer (LANL), A. Parsons (GSFC), J. Tueller (GSFC) on behalf of the Swift BAT team. The INTEGRAL-Swift Burst of 041219 (GCN 2866, Gotz et al, GCN 2874, Barthelmy et al.) had a time history that is rather rare: a precursor was followed by 200 sec of mostly quiet emission before a huge spiky outburst that lasted an additional 300 sec. This is one of the few events for which there have been simultaneous ground observations. It is the first event with simultaneous IR observations (GCN 2870, Blake and Bloom) and there has been a near-threshold detection in the optical (GCN 2889, Wren et al.). Given the large interest in this burst and the scientific value of combining the simultaneous gamma-ray and ground observations, we provide at the web site below the GRB041219 4-channel data (15-25 keV, 25-50 keV, 50-100 keV, 100-350 keV) for -341 s before to +558 s after the BAT trigger with 0.064 s resolution. Provided are figures for each energy band, the 15 - 350 keV energy band, and a text table of the data. We have not corrected for the deadtime. Testing has shown that our saturation level is > 1E6 Hz, so we were orders of magnitude below our saturation limit. The background was very smooth before the event and, apparently, also within the 8 minute long burst. Beyond 560 s after the trigger, there is a long smooth increase in the count rate, but it does not image to a point source, so it is probably due to trapped radiation. We used 300 s of data ending at 41 s before the trigger to determine background. Many features are common to other GRBs: peaks that are narrower at higher energy, peaks with FWHM of ~ 1 s, and a general softening of the event with time. Time in the figure is from the BAT initial trigger at 6138.68 UT. BAT located the event 14 s later, at which time Swift would have slewed XRT and UVOT as well as sent out a TDRSS notice if slewing and TDRSS messages had been enabled. See http://gcn.gsfc.nasa.gov/gcn/other/041219_swift_bat.html //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2916 SUBJECT: NIR Observations of GRB 041219 DATE: 04/12/28 07:44:54 GMT FROM: Don Lamb at U.Chicago NIR Observations of GRB 041219 F. Hearty (Colorado), D. Q. Lamb (Chicago), J. Barentine (APO), P. A. Price (Hawaii), S. Beland (Colorado), E. L. Turner (Princeton), R. McMillan (APO), J. Dembicky (APO), B. Ketzeback(APO), and D. G. York (Chicago) report on behalf of the ARC team of the FUN GRB collaboration: We observed the NIR afterglow (Blake and Bloom, GCN Circular No. 2870) of GRB 041219, a burst localized by Integral (Gotz et al., GCN Circular No. 2866) and Swift-BAT (Barthelmy et al., GCN Circular No. 2874), on the night of December 20th, using C-NIC (formerly NIC-FPS) on the ARC 3.5-meter telescope at Apache Point Observatory. The observation began at 01.05 UT, 47.25 hours after the burst, and consisted of a series of 120, 20, and 20-second exposures in J, H, and Ks, respectively. We constructed stacked images corresponding to 20-minute exposures in J and H, and a 40-minute exposure in Ks. We detect the afterglow in all three filters; the magnitudes are J = 19.9 +/- 0.2, H = 18.9 +/- 0.1, and Ks = 17.6 +/- 0.2. We thus confirm that the afterglow is heavily reddened, as previously noted by Blake and Bloom (GCN Circular No. 2870). We also confirm that the afterglow had faded significantly in comparison with the earlier NIR observations reported by Blake and Bloom (GCN Circular No. 2870) and Moon, Cenko, and Adams (GCN Circular Nos. 2876 and 2884), in agreement with the conclusion of Bloom et al. (GCN Circular No. 2893). As noted by Bloom et al. (GCN Circular No. 2893), the IR afterglow is located 2.5 arcseconds south-south-west of a faint compact source that is visible in J, H, and Ks. Using Schlegel et al. (1998), the estimated extinction in the direction of GRB 041219 is E(B-V) = 1.8 mag, corresponding to A_lambda values of J = 1.6, H = 1.0, K = 0.65 mag. These values give J-H = 0.6, H-K = 0.4, and J-K = 1 mag, compared to our measured values of J-H = 1.0, H-K = 1.3, and J-K = 2.3 mag. Although our results indicate greater reddening than that estimated using Schlegel et al. (1998), the estimated value of E(B-V) is unreliable because GRB 041219 lies very close to the Galactic plane (b = 0.6 [deg]). We therefore cannot say that there is more reddening than can be accounted for by Galactic extinction. However, our results show that the drop-off with decreasing wavelength is gradual and therefore is unlikely to be due to absorption by hydrogen in the host galaxy or along the line of sight to the host galaxy. Consequently, the burst is unlikely to lie at a very high redshift (z > 5). This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2917 SUBJECT: GRB041219; RXTE ASM Observations DATE: 04/12/28 16:42:09 GMT FROM: Al Levine at MIT Alan Levine and Ron Remillard (MIT) on behalf of the RXTE ASM Team at MIT and GSFC: GRB041219 (Mereghetti et al., GCN Circular 2866; and Barthelmy et al., GCN Circular 2874) was observed during two dwells, each of duration 90 s, with Scanning Shadow Camera 3 of the RXTE ASM. The observations cover the interval 2004 December 19 1:42:24 to 1:45:30 UTC except for a single 6 s gap in the middle of the interval. Automated real-time analysis of RXTE ASM data yielded a detection of GRB041219 and an error box: RA, Dec (error box center; J2000): 7.085 62.727 degrees Position angle of the error box long direction): 105.72 degrees Error box half width: 0.037 degrees Error box half length: 0.7 degrees in which is found the position derived by Bloom et al. (GCN Circular 2893). In count rate data, the event appears as a single peak with possible substructure lasting about 50 s in the 1.5-3 keV and 3-5 keV bands and about 25 s in the 5-12 keV band. The peak fluxes were approximately 3, 4 and 6 Crab in the 1.5-3, 3-5, and 5-12 keV bands, respectively. The initial sharp rise of this peak (best defined in the 5-12 keV band) occurs at UTC 2004:354:01:43:30 with an uncertainty of about 2 seconds. The background before this time appears to vary; this could be the tail of an earlier GRB-related peak or it could be variation of an unrelated source. The times quoted herein are times at the position of the spacecraft; they have not been corrected to the barycenter of the solar system. In the time interval covered by the ASM, the Swift BAT light curves (Fenimore et al., GCN Circular 2906) show a single relatively inconspicuous small enhancement that appears to start at about the same time as the peak seen in the ASM data. The ASM coverage does not cover the first peak seen by BAT or the later strong peaks. This message is citeable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2924 SUBJECT: GRB041219, early time observations DATE: 04/12/30 17:28:28 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: In addition to the BVRcIc calibration, we also acquired some early time, short exposure Rc and Ic imagery for the INTEGRAL burst GRB041219 (Gotz et al., GCN 2866) with the USNOFS 1.0-m telescope. At the position of the NIR afterglow (Blake and Bloom, GCN 2872), we find no optical afterglow in the Ic bandpass at t+13minutes, to a limit of Ic=19.7.