//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4867 SUBJECT: GRB 060313: Swift-BAT detection of a bright short hard burst DATE: 06/03/13 00:47:42 GMT FROM: Scott Barthelmy at NASA/GSFC C. Pagani (PSU), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), N. Gehrels (GSFC), D. Grupe (PSU), S.T. Holland (GSFC/USRA), S. Hunsberger (PSU), C. Markwardt (GSFC/UMD), F. Marshall (GSFC), D. Palmer (LANL) on behalf of the Swift team: At 00:12:06 UT, Swift-BAT triggered and located GRB 060313 (trigger=201487). The spacecraft slewed immediately. The BAT on-board calculated location is RA,Dec 66.609d,-10.872d {04h 26m 26s,-10d 52' 19"} (J2000), with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys). The BAT light curve shows two slightly overlapping peaks with a total duration of ~1.6 sec. The first peak start at ~T-0.7 sec and the second peak ends by T+0.9 sec. The peak count rate was ~40,000 counts/sec (15-350 keV), at ~0.0 seconds after the trigger. This is definitely a short hard burst. The XRT began taking data at 00:13:24 UT, 79 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image and no prompt position is available. We are waiting for down-linked data to detect and determine a position for the source. UVOT took a finding chart exposure of 200 seconds with the V filter starting 78 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 18th mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction of about 0.2 magnitudes. We note that the magnitude B=16.3 galaxy LEDA 3093309 (aka NPM1G -10.0175) is within 5 arcminutes of the BAT position, however there is currently no evidence for a physical association between these two objects. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4868 SUBJECT: GRB060313: optical and near infrared observations with REM DATE: 06/03/13 01:27:51 GMT FROM: Andrea Melandri at Rome Astro Obs A. Melandri, S. Covino, E. Molinari, G. Chincarini, F.M. Zerbi, V. Testa, G. Tosti, F. Vitali, L.A. Antonelli, P. Conconi, G. Cutispoto, G. Malaspina, L. Nicastro, E. Palazzi, E. Meurs, P. Goldoni, on behalf of the REM/ROSS Team We imaged the field of the short hard burst GRB 030613 (GCN 4867, Pagani et al.) with the robotic 60-cm REM telescope located at La Silla, Chile. The observations were performed both with the optical and the infrared camera of the REM telescope and started about 33 seconds after the GCN alert and about 45 seconds after the burst. First inspection of visual and infrared images do not reveal any new source inside the Swift-BAT error circle (GCN 4867, Pagani et al.) down to the limiting magnitude of the 2MASS catalog. Further observations and analises are still ongoing. This message is citeable. ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/ //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4869 SUBJECT: GRB 060313, SMARTS optical/IR observations DATE: 06/03/13 01:46:32 GMT FROM: Bethany Cobb at Yale U B. E. Cobb, part of the larger SMARTS consortium, reports: Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 060313 (Pagani et al. GCN 4867) beginning ~0.3 hours post-burst (2006-03-13 00:31 UT). Optical imaging in B,V,R and I has a field of view of 6'x6' and, therefore, covers the entire GRB error circle. IR imaging in J, H, K and Y has a smaller field of view (2.4'x2.4') and covers a region totaling 5.8 square arcminutes in the middle of the quoted error region. Several dithered images were obtained in each filter, with total summed exposure times of 180s in each of BRIYJK and 120s in each of H and V. Preliminary visual comparison of the optical images to the DSS and the IR images to 2MASS frames does not reveal any new sources. The detection limits of the combine ANDICAM images are slightly shallower than that of MASS and the DSS. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4870 SUBJECT: GRB 060313: Swift XRT position DATE: 06/03/13 03:43:51 GMT FROM: Claudio Pagani at PSU/Swift-XRT C. Pagani (PSU), D. Burrows (PSU) report on behalf of the Swift XRT team: We have analyzed the Swift XRT data from the first orbit of observation of GRB 060313 (Pagani et al., GCN 4867). We find an uncatalogued source at the following location: RA(J2000) = 04h 26m 28.4s Dec(J2000) = -10d 50m 41.5s We estimate an uncertainty of 8 arcseconds radius (90% containment). This position is 103 arcseconds from the BAT position given in GCN 4867. A full analysis of the XRT data will follow. This circular is an official product of the Swift XRT Team. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4871 SUBJECT: GRB 060313: Possible optical counterpart DATE: 06/03/13 04:26:31 GMT FROM: Andrew Levan at U.of Leicester A.J. Levan (U. Hertfordshire), J. Hjorth (Dark Cosmology Centre) report for the GRACE collaboration: We observed the location of the short hard GRB 060313 (Pagani et al. GCN 4867) with the VLT and FORS2 beginning at 01:28 UT. At the location of the X-ray afterglow reported by Pagani et al. (GCN 4870) we find a point source which is not visible in the DSSII (red) although is somewhat brighter than its limiting magnitude. We suggest this is the afterglow of GRB 060313. The location of the source is: RA = 04:26:28.4 Dec = -10:50:40.1 Currrently we estimate our uncertainty in this position is ~0.5" in each axis. Further observations are planned. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4872 SUBJECT: GRB 060313, SMARTS optical counterpart? DATE: 06/03/13 04:49:22 GMT FROM: Bethany Cobb at Yale U B. E. Cobb, part of the larger SMARTS consortium, reports: Following the report of a possible X-ray afterglow to GRB 060313, the SMARTS imaging described in GCN 4869 was re-examined. The X-ray position is unfortunately outside our NIR imaging. In our R and I band images, however, there is a possible optical counterpart within the X-ray detection error region, at preliminary coordinates of: RA = 4:26:28.45 Dec = -10:50:39.9 The source is only detected at the 1 sigma level, but the fact that it is visible in both R and I suggests the source is not spurious. The source is not detected in the DSS images. In comparison with several nearby USNO-B1.0 stars, the source has a magnitude of R ~ 19.9 +/- 0.3. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4873 SUBJECT: GRB 060313: Refined analysis of the Swift-BAT bright short hard burst DATE: 06/03/13 05:43:42 GMT FROM: Scott Barthelmy at NASA/GSFC C. Markwardt (GSFC/UMD), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-60 to T+123 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060313 (trigger #201487) (Pagani, et al., GCN 4867). The BAT ground-calculated position is RA,Dec = 66.624,-10.859 deg {04h 26m 29.8s,-10d 51' 30.9"} (J2000) +- 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 54%. The lightcurve shows 3 or 4 overlapping peaks. They start with a very fast rise (less than 40 msec). There is a possibility of further faint emission past the end of the last peak (T+1 to T+2 sec). T90 (15-350 keV) is 0.7 +- 0.1 sec (estimated error including systematics). The time-averaged spectrum from T+0.06 to T+0.94 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.71 +- 0.07. The fluence in the 15-150 keV band is 1.13 +- 0.05 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.01 sec in the 15-150 keV band is 12.1 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4874 SUBJECT: GRB060313: optical observations of the afterglow candidate DATE: 06/03/13 06:16:28 GMT FROM: Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr Christina Thoene, Chloe Feron, Jens Hjorth and Brian L. Jensen (Dark Cosmology Centre) report We obtained R and I band observations of GRB 060313 (GCN 4867) with the Danish 1.5m telescope and DFOSC at La Silla. Observations started at UT 00:23:53 (11min after the burst) until UT 02:11:10. Inside the XRT error circle (GCN 4870) we detect a new, previously uncatalogued source at the position (J2000) RA = : 04:26:28.42 Dec =-10:50:39.84 This is consistent with the position reported in GCN 4871 and GCN 4872. The R magnitude obtained from stacked images with a mean time of about 1h after the burst is R = 20.4 (based on preliminary photometric zero points) A finding chart can be found at: http://www.astro.ku.dk/~brian_j/grb/grb060313.008/ //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4875 SUBJECT: GRB 060313: Swift-XRT team refined analysis DATE: 06/03/13 06:38:57 GMT FROM: Claudio Pagani at PSU/Swift-XRT C. Pagani (PSU), D. Morris (PSU), D. Grupe (PSU) and D. Burrows (PSU) report on behalf of the Swift XRT team: We have analyzed the first two orbits of Swift XRT data of GRB 060313 (Pagani et al., GCN 4867). The revised XRT position is RA(J2000) = 04h 26m 28.5s Dec(J2000) = -10d 50m 40.2s We estimate an uncertainty of 4 arcseconds radius (90% containment). The revised position is 2 acrseconds from the suggested optical afterglow reported by Levan et al. (GCN 4871) and 1.5 arcseconds form the previously reported XRT position (GCN 4870). The X-ray spectrum of the data can be fitted by a single absorbed power law with a photon index Gamma=1.70+/-0.10 and an absorption column density nH consistent with the Galactic value of 4.7e20cm-2; Dickey & Lockman 1990. The light curve shows a decay during with alpha=1.50+/-0.18. Assuming this decay slope the prediction for the flux 24 hours after the trigger is 1.2e-13 ergs/s/cm2. This circular is an official product of the Swift XRT Team. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4876 SUBJECT: GRB060313:Gemini South Observations DATE: 06/03/13 09:55:02 GMT FROM: Brian Schmidt at RSAA, ANU (MSSSO) B. Schmidt (ANU), Derek Fox (Penn State), and Edo Berger (OCIW), on behalf of a larger collaboration report, "We have obtained a series of r-band images with Gemini-S + GMOS between UT Mar 13.058 and March 13.096 of GRB 060313 (Pagani et al. GCN 4867) of the OT-candidate of Levan and Hjorth (GCN 4871). Comparison with USNOA2 star located at RA=04:26:28.906 DEC=-10:51:00.16 (J2000) R=18.1 shows the OT-candidate to be 2.19 magnitudes fainter than the star at Mar 13.058, and 2.26 mags fainter at Mar 13.096, a marginally significant difference. It is possible that an underlying host galaxy is significantly affecting the photometry. We would like to thank the Gemini Staff for their help in executing these Target of Opportunity observations." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4877 SUBJECT: GRB 060313: Swift/UVOT Observations DATE: 06/03/13 10:29:02 GMT FROM: Patricia Schady at MSSL/Swift P. Schady (PSU/MSSL-UCL) C. Pagani (PSU) on behalf of the Swift/UVOT team The Swift/UVOT began taking data on the field of GRB 060313 at 00:13:23 UT on 2006-03-13, approximately 79s after the BAT trigger (Pagani et al., GCN 4867). The afterglow is detected above the 2-sigma level in the V, B and UVW2 filter at a position consistent with that reported by Cobb et al. (GCN 4872), and there is a tenuous detection in the U and UVW1 band coadded exposures at the 1.4 and 1.2 sigma level, respectively. The detection in UVW2 implies that the Lyman limit must be blueward of ~2500 A, providing a redshift upper limit of z <~1.7. All detections above 2-sigma and the 2-sigma upper limits from the coadded image of a set of exposure for each filter are as follows: Filter T_range(s) Exp(s) Average mag/UL sigma V 177-6963 933 20.03+/-0.39 2.9 B 469-5453 953 20.69+/-0.48 2.7 U 415-844 100 > 19.95 UVW1 361-790 100 > 18.91 UVM2 307-736 100 > 18.89 UVW2 578-900 950 20.98+/-0.5 2.2 These magnitudes are uncorrected for Galactic extinction; E(B-V) = 0.067. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4878 SUBJECT: GRB 060313: PROMPT Observations DATE: 06/03/13 19:53:36 GMT FROM: Melissa Nysewander at UNC,Chapel Hill M. Nysewander, J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, J. A. Crain, A. Foster, J. Kirschbrown, C. MacLeod, and A. Trotter report on behalf of the UNC team of the FUN GRB Collaboration: Skynet observed the localization of GRB 060313 (Pagani et al., GCN 4867) with two of the 16-inch PROMPT telescopes at CTIO beginning 43.7 min after the burst in r'i'I. A preliminary analysis of the data shows the candidate afterglow first reported by Levan & Hjorth (GCN 4871) to be at r' = 19.9 +- 0.3 and I = 19.7 +- 0.3 at mean times of 1.3 hours and 1.4 hours after the burst. PROMPT also made a marginal detection (~2 sigma) of i' ~ 20.5 at a mean time of 1.5 hours after the burst. We used five calibration stars that were taken from the USNO-B1.0 and NOMAD catalogues and transformed to the SDSS filters via Smith et al. 2002. PROMPT is currently being built and commissioned. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4879 SUBJECT: GRB 060313: Further analysis of the Swift-BAT bright short hard burst DATE: 06/03/14 00:11:51 GMT FROM: Scott Barthelmy at NASA/GSFC S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), J. Norris (GSFC), T. Sakamoto (GSFC/NRC), D. Palmer (LANL on behalf of the Swift-BAT team: Using the data set from T-300 to T+300 sec from additional telemetry downlinks, we report further analysis of BAT GRB 060313 (trigger #201487) (Pagani, et al., GCN 4867; Markwardt, et al., 4873). This short burst does not show any sign of extended emission in the T+1 to T+300 sec range at an upper limit of 0.001 cnt/detector/sec. This corresponds to a flux ratio upper limit between the initial peak and the peak of any potential extended emission of 2000. We reference SHBs 050724 and 051227 which had ratios of 46 and ~10, respectively. The lag analysis shows this burst to be cleanly in the short hard burst class (Norris and Bonnell, 2006, ApJ, accepted; see, Figure 3). Specifically, the measured lags are: 50-100 keV to 15-25 keV: 0.8 ms +- 0.6 ms 100-350 keV to 25-50 keV: 0.3 ms +- 0.7 ms We further note that the lightcurve has multiple structures. There are at least 20 statistically significant peaks with FWHM in the 5-15 msec range. There is no perdiodic structure in the lightcurve for at least the first 100 sec. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4880 SUBJECT: GRB060313: SSO 40inch Observations DATE: 06/03/14 00:24:08 GMT FROM: Brian Schmidt at RSAA, ANU (MSSSO) B. Schmidt and D. Bayliss (ANU), on behalf of a larger collaboration report, "We have obtained a series of R-band images with 40inch telescope + WFI starting at UT Mar 13.358 of GRB 060313 (Pagani et al. GCN 4867) of the OT-candidate of Levan and Hjorth (GCN 4871). Comparison of the image with those taken with Gemini-S (Schmidt et al. GCN 4876) shows the OT-candidate has faded by at least 0.4 magnitudes (95% confidence). Although not detected, using the USNOA2 star located at RA=04:26:28.906 DEC=-10:51:00.16 (J2000) R=18.1 as a reference, we estimate the OT to be fainter than R=20.5 (95% confidence). This variability confirms the association of the OT with GRB060313." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4881 SUBJECT: Konus-Wind observation of GRB 060313 DATE: 06/03/14 15:54:19 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report: The GRB 060313 (Swift-BAT trigger #201487; Pagani et al., GCN 4867; Markwardt et al., GCN 4873) triggered Konus-Wind at T0=726.354 s UT (00:12:06.354). The Konus-Wind light shows several multipeaked pulses with a total duration of ~0.8 sec. As observed by Konus-Wind the burst had a fluence of 1.42(-0.85, +0.10)x10^-5 erg/cm2 and peak flux on 16-ms time scale measured from T-T0=0.560 sec 7.0(-4.3, +1.0)x10^-5 erg/cm2/sec (both in the 20 keV - 2 MeV energy range). The time-integrated spectrum of the GRB is well fitted (in the 20 keV - 2 MeV range) by a power law with exponential cutoff model: dN/dE ~ E^(-alpha) * exp(-(2-alpha)*E/Ep) with alpha = 0.60(-0.22, +0.19) and Ep = 922(-177, +306) keV (chi2 = 62/59 dof). The fitting of the spectrum of the GRB initial part (accumulated from T-T0=0 to T-T0=0.192 sec in the same energy range) gives an unusual photon index alpha: alpha = -0.33(-0.29, +0.25) Ep = 655(-74, +84) (chi2 = 51/59 dof). All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB060313_T00726/ //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4883 SUBJECT: GRB 060313: early afterglow NIR upper limits with REM DATE: 06/03/15 20:40:52 GMT FROM: Andrea Melandri at Rome Astro Obs A. Melandri, S. Covino, E. Palazzi, L.A. Antonelli, E. Molinari, G. Chincarini, F.M. Zerbi,, V. Testa, G. Tosti, F. Vitali, P. Conconi, G. Cutispoto, G. Malaspina, L. Nicastro, E. Meurs, P. Goldoni, on behalf of the REM/ROSS Team The field of the short hard burst GRB 060313 (GCN 4867, Pagani et al.) was imaged by the robotic 60-cm REM telescope with the both infrared (REMIR) and optical (ROSS) camera. Observations started about 33 seconds after the GCN alert about 45 seconds after the burst and a total exposure time of 325, 425 and 325 seconds was obtained with J, H and Ks filter respectively. Preliminary results on these data have been reported in GCN 4868 (Melandri et al.). A refined analysis have been performed on the IR stacked images and no new source is found within the XRT refined error circle (Pagani et al., GCN 4875) and at the position of the OT-candidate suggested by Levan and Hjorth (GCN 4871). We derive the following upper limits for the NIR afterglow: Filter Delta_T (days) Mag_Lim (5 sigma) J 0.018 17.6 H 0.012 17.2 Ks 0.010 16.5 Optical images, acquired with the ROSS optical camera in the I, R and V filters, do not allow to obtain useful information because of a large contamination due to the Moon light. We were able to derive an upper limit only of R > 17.5. This message is citeable. ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/ [GCN OPS NOTE(15mar06): Per author's request, "030613" in the first sentence was changed to "060313".] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4884 SUBJECT: GRB060313: Radio Observations DATE: 06/03/16 16:40:58 GMT FROM: Alicia Soderberg at Caltech A. M. Soderberg (Caltech) and D. A. Frail (NRAO) report on behalf of a large collaboration: "We observed the field of GRB 060313 with the Very Large Array on 2006 March 15.13 UT. No radio source is detected at the position of the optical afterglow (GCN 4871). We place an upper limit of 0.11 mJy (3-sigma) at 8.46 GHz."