////////////////////////////////////////////////////////////////////// TITLE: GCN/HETE BURST POSITION NOTICE NOTICE_DATE: Fri 18 Apr 03 09:59:59 UT NOTICE_TYPE: HETE S/C_Alert TRIGGER_NUM: 2686, Seq_Num: 1 GRB_DATE: 12747 TJD; 108 DOY; 03/04/18 GRB_TIME: 35958.85 SOD {09:59:18.85} UT TRIGGER_SOURCE: Trigger on the 25-400 keV band. WXM_SIG/NOISE: 0.1 sig/noise on a 13.280 [sec] timescale SC_-Z_RA: 172 [deg] SC_-Z_DEC: -15 [deg] SC_LONG: 234 [deg East] SUN_POSTN: 25.97d {+01h 43m 54s} +10.75d {+10d 45' 03"} MOON_POSTN: 228.54d {+15h 14m 10s} -17.07d {-17d 04' 13"} MOON_ILLUM: 96 [%] COMMENTS: Probable GRB. ////////////////////////////////////////////////////////////////////// TITLE: GCN/HETE BURST POSITION NOTICE NOTICE_DATE: Fri 18 Apr 03 10:02:54 UT NOTICE_TYPE: HETE S/C_Update TRIGGER_NUM: 2686, Seq_Num: 2 GRB_DATE: 12747 TJD; 108 DOY; 03/04/18 GRB_TIME: 35958.85 SOD {09:59:18.85} UT TRIGGER_SOURCE: Trigger on the 25-400 keV band. WXM_SIG/NOISE: 0.1 sig/noise on a 6.080 [sec] timescale SC_-Z_RA: 172 [deg] SC_-Z_DEC: -15 [deg] SC_LONG: 234 [deg East] WXM_CNTR_RA: 163.781d {+10h 55m 07s} (J2000), 163.823d {+10h 55m 17s} (current), 163.150d {+10h 52m 36s} (1950) WXM_CNTR_DEC: -7.097d {-07d 05' 47"} (J2000), -7.114d {-07d 06' 51"} (current), -6.830d {-06d 49' 46"} (1950) WXM_MAX_SIZE: 28.00 [arcmin] diameter WXM_LOC_SN: 6 sig/noise (pt src in image) WXM_IMAGE_SN: X= 5.2 Y= 3.0 [sig/noise] WXM_LC_SN: X= 8.5 Y= 3.0 [sig/noise] SUN_POSTN: 25.97d {+01h 43m 54s} +10.75d {+10d 45' 03"} SUN_DIST: 138.23 [deg] MOON_POSTN: 228.54d {+15h 14m 10s} -17.07d {-17d 04' 13"} MOON_DIST: 63.80 [deg] MOON_ILLUM: 96 [%] GAL_COORDS: 259.27,45.69 [deg] galactic lon,lat of the burst ECL_COORDS: 167.85,-12.92 [deg] ecliptic lon,lat of the burst COMMENTS: Probable GRB. COMMENTS: WXM error box is circular; not rectangular. ////////////////////////////////////////////////////////////////////// TITLE: GCN/HETE BURST POSITION NOTICE NOTICE_DATE: Fri 18 Apr 03 10:03:17 UT NOTICE_TYPE: HETE S/C_Last TRIGGER_NUM: 2686, Seq_Num: 3 GRB_DATE: 12747 TJD; 108 DOY; 03/04/18 GRB_TIME: 35958.85 SOD {09:59:18.85} UT TRIGGER_SOURCE: Trigger on the 25-400 keV band. WXM_SIG/NOISE: 0.1 sig/noise on a 6.080 [sec] timescale SC_-Z_RA: 172 [deg] SC_-Z_DEC: -15 [deg] SC_LONG: 234 [deg East] WXM_CNTR_RA: 163.781d {+10h 55m 07s} (J2000), 163.823d {+10h 55m 17s} (current), 163.150d {+10h 52m 36s} (1950) WXM_CNTR_DEC: -7.097d {-07d 05' 47"} (J2000), -7.114d {-07d 06' 51"} (current), -6.830d {-06d 49' 46"} (1950) WXM_MAX_SIZE: 28.00 [arcmin] diameter WXM_LOC_SN: 6 sig/noise (pt src in image) WXM_IMAGE_SN: X= 5.2 Y= 3.0 [sig/noise] WXM_LC_SN: X= 8.5 Y= 3.0 [sig/noise] SUN_POSTN: 25.97d {+01h 43m 54s} +10.75d {+10d 45' 03"} SUN_DIST: 138.23 [deg] MOON_POSTN: 228.54d {+15h 14m 10s} -17.07d {-17d 04' 13"} MOON_DIST: 63.80 [deg] MOON_ILLUM: 96 [%] GAL_COORDS: 259.27,45.69 [deg] galactic lon,lat of the burst ECL_COORDS: 167.85,-12.92 [deg] ecliptic lon,lat of the burst COMMENTS: Probable GRB. COMMENTS: WXM error box is circular; not rectangular. ////////////////////////////////////////////////////////////////////// TITLE: GCN/HETE BURST POSITION NOTICE NOTICE_DATE: Fri 18 Apr 03 11:43:01 UT NOTICE_TYPE: HETE Ground Analysis TRIGGER_NUM: 2686, Seq_Num: 4 GRB_DATE: 12747 TJD; 108 DOY; 03/04/18 GRB_TIME: 35958.84 SOD {09:59:18.84} UT TRIGGER_SOURCE: Trigger on the 25-400 keV band. WXM_SIG/NOISE: 0.1 sig/noise on a 6.080 [sec] timescale SC_-Z_RA: 170 [deg] SC_-Z_DEC: -15 [deg] SC_LONG: 234 [deg East] WXM_CNTR_RA: 163.721d {+10h 54m 53s} (J2000), 163.763d {+10h 55m 03s} (current), 163.090d {+10h 52m 22s} (1950) WXM_CNTR_DEC: -6.990d {-06d 59' 22"} (J2000), -7.007d {-07d 00' 26"} (current), -6.723d {-06d 43' 22"} (1950) WXM_MAX_SIZE: 18.00 [arcmin] diameter WXM_LOC_SN: 9 sig/noise (pt src in image) WXM_IMAGE_SN: X= 10.5 Y= 6.5 [sig/noise] WXM_LC_SN: X= 25.5 Y= 12.0 [sig/noise] SUN_POSTN: 25.97d {+01h 43m 54s} +10.75d {+10d 45' 03"} SUN_DIST: 138.16 [deg] MOON_POSTN: 228.54d {+15h 14m 10s} -17.07d {-17d 04' 13"} MOON_DIST: 63.89 [deg] MOON_ILLUM: 96 [%] GAL_COORDS: 259.11,45.73 [deg] galactic lon,lat of the burst ECL_COORDS: 167.75,-12.85 [deg] ecliptic lon,lat of the burst COMMENTS: Definite GRB. COMMENTS: WXM error box is circular; not rectangular. COMMENTS: Burst_Validity flag is true. COMMENTS: WXM data refined since S/C_Last Notice. /////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2148 SUBJECT: GRB 030418: Optical afterglow candidate DATE: 03/04/18 14:09:27 GMT FROM: Paul Price at RSAA, ANU P.A. Price, R. McNaught, G.J. Garradd, M.A. Verrender and T.M. Smith (RSAA, ANU) report: We have observed the error-circle of HETE trigger #2686 (GRB 030418) with the Siding Spring Observatory 40-inch telescope + Direct Imager. Our observations consisted of 5x300 sec exposures in R-band, commencing at April 18.51 UT. We identify in our images a source not present on the DSS2 F or N plates. The source has no apparent proper motion between our images, and is located at: RA: 10:54:33.69 Dec: -7:01:40.8 J2000 with an estimated error of 0.5 arcsec. We estimate that the source was R ~ 18.8 mag at the time of our observations. Further observations are planned. This message may be cited. /////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2149 SUBJECT: GRB 030418: Finder for afterglow candidate DATE: 03/04/18 14:54:25 GMT FROM: Paul Price at RSAA, ANU P.A. Price, R. McNaught, G.J. Garradd, M.A. Verrender and T.M. Smith (RSAA, ANU) report: A finding chart for the GRB 030418 optical afterglow candidate (GCN #2148) is available from: http://www.mso.anu.edu.au/~pap/grb030418finder.ps The offset from star A (marked) to the optical afterglow candidate is 29.02" W, 22.05" S. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2150 SUBJECT: GRB 030418: Optical afterglow DATE: 03/04/18 15:35:07 GMT FROM: Paul Price at RSAA, ANU P.A. Price, R. McNaught, G.J. Garradd, M.A. Verrender and T.M. Smith (RSAA, ANU) report: We have re-observed the GRB 030418 optical afterglow candidate (GCN #2148) with the Siding Spring Observatory 40-inch telescope + Direct Imager. Our observations consisted of another 5x300 sec exposures in R-band, commencing at April 18.61 UT. Comparison of our two epochs reveals that the source faded by about 1 magnitude between the two observations, being R ~ 19.8 mag in the second epoch. We therefore believe this source is the optical afterglow of GRB 030418. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2151 SUBJECT: GRB030418: Kiso near infrared observations DATE: 03/04/18 17:21:50 GMT FROM: Yuji Urata at RIKEN H. Mito, S. Nishiura and Y. Urata on behalf of the Kiso GRB team: " We have observed the field of GRB030418(=H2686) using the Kiso observatory 1.05 m Schmidt telescope with near infrared camera KONIC. The KONIC has circular field of view with 8.5'radius. We started to observe the center region of HETE S/C_Update (Seq_Num 2) with J, H, Ks band at 21 min after the burst. The afterglow reported Price et al. (GCN2148) is out of these images. We re-pointed to the field including the afterglow position at 69 min after the burst, . We obtained five J-band images with 300 s exposures. We could not identify the afterglow with the limiting magnitude J ~ 13 (3 sigma) at the 69 min after the burst. We estimated it comparison with 2MASS J1054356-070118. The more accurate analysis are in progress." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2152 SUBJECT: GRB030418: Upper limits from recent and historical observations. DATE: 03/04/18 18:30:37 GMT FROM: Michael Wood-Vasey at UC Berkeley/LBNL/SNfactory W. M. Wood-Vasey, Lawrence Berkeley National Laboratory, using images obtained by R. Bambery, S. Pravdo, M. Hicks, and K. Lawrence (Near-Earth Asteroid Tracking project, Jet Propulsion Laboratory), reports historical upper limits for the optical transient for GRB 030418 of Price et. al (GCN #2148) from images taken with the Haleakala MSSS 1.2-m and Palomar Oschin 1.2-m telescopes from 2001 Apr 19 -- 2003 Mar 28. A co-addition of these images (Haleakala: 2001 Apr 19, May 7, 2002 Jan 8, Jan 14, Feb 4; Palomar: 2002 Feb 7, Feb 17, Mar 9, Apr 8, Apr 19, May 11, 2003 Mar 28) shows nothing at this location to a combined limiting magnitude of 22.81 (S/N = 3). The co-addition is available at: http://supernova.lbl.gov/~wwoodvas/GRB/#GRB030418 This message may be cited. All dates UT. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2153 SUBJECT: ROTSE-III prompt optical detections of GRB 030418 DATE: 03/04/18 22:15:10 GMT FROM: Don Smith at U michigan Smith, D. A., Rykoff, E. S., McKay, T. A. report on behalf of the ROTSE collaboration: The ROTSE-IIIa robotic telescope at Siding Springs Observatory, NSW, responded automatically to the two HETE alerts for this burst, in each case beginning a ~45 minute sequence of unfiltered observations within six seconds of the alert time stamp, the first of which was 238 s after the burst. Each image sequence began with 10 5-s images and then continued with 90 20-s images. The 20-s images reached typical limiting magnitudes of 17.5 calibrated against the USNO A2.0 catalog in R band, while the 5-second images reached 16.9. Sensitivity was degraded by the full moon. Automated software searched these frames for variable sources not in the USNO catalog and failed to identify any counterpart candidates. In particular, no source was initially detected at the location of the optical counterpart reported by Price et al. (GCN Circ. 2148). Co-addition of multiple frames, however, yielded significant detections of the optical transient. We co-added our 200 observations into groups of ten, and found that from 10:05:23 to 10:50:05, and again from 11:43:07 to 12:20:42, we measure the transient to vary irregularly between 18.7 and 17.4, with errors of order 0.15 mag. This means that from 360 s to 2.3 h after the burst, the transient showed no evidence for decay, in marked contrast to other bursts that have been observed at early times, such as 990123 and 021211. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2158 SUBJECT: MASTER:optical observations GRB030418 DATE: 03/04/21 00:11:07 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A. Krylov, V. Kornilov, G. Borisov, A. Belinski, I. Chilingarian, D. Kuvshinov, M.V. Kuznetsov, S. Potanin, V. Vitrischak Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow report: The error box of GRB030418 (HETE 2679) was observed with MASTER system (280mm, http://observ.pereplet.ru). We obtained 20 measurements in R filter. Our observations started at Apr 18, 21:00 UT (11 hours after the GRB) and had been lasting for 2.5 hours up to Apr 18 22:36 UT (12,5 hours after the GRB). There is no OT brighter than 16.5 (R-band) in error box. Transparency was quite poor due to low altitude of the field above the horizont. Our fits-images are available at: http://observ.pereplet.ru/images/GRB030418/30S9.zip This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2168 SUBJECT: Optical Observations of GRB 030418 with Magellan DATE: 03/04/25 01:11:43 GMT FROM: George Ricker at MIT Optical Observations of GRB 030418 with Magellan A. Dullighan, N. R. Butler, G. R. Ricker, J. L. Elliot, K. Clancy (MIT), and D. Osip (Las Campanas Observatory) report: On 2003 April 21.01 UT, we observed the optical afterglow (Price et al; GCN2148) of the HETE-localized GRB 030418 (=H2686) with the Magellan 6.5 meter Clay telescope at Las Campanas Observatory in Chile. Our observations consisted of three 300s R-Band images and one 300s I-Band image, taken with the MagIC instrument. The afterglow brightness had declined significantly since the measurement reported in GCN2148, consistent with a power law decay index = 1.3+/-0.1. The afterglow was still point-like in our images, with a FWHM of 0.5 arcsec. Our results were as follows: UT t-t0 (days) Mag 2003-04-21.02 2.60 R=23.64 +/- 0.07 2003-04-21.03 2.61 I=22.60 +/- 0.05 The magnitudes reported above are relative to those of the USNO B1 catalog star at RA = 10h 54m 32.71s, Dec = -07:02:16.4 (J2000), taken as having R=19.33 and I=18.31. Magnitude errors for the USNO star were not available, and so are not included in the errors we report here. Possible errors in the magnitudes of the USNO catalog star should be taken into account when comparing our afterglow magnitudes to other measurements. Further observations are planned. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2210 SUBJECT: GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM DATE: 03/05/06 19:08:39 GMT FROM: Don Lamb at U.Chicago Y. Shirasaki, C. Graziani, T. Donaghy, M. Matsuoka, M. Suzuki, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, Y. Nakagawa, D. Takahashi, R. Satoh, and Y. Urata, on behalf of the HETE WXM Team; N. Butler, R. Vanderspek, G. Crew, J. Doty, J. Villasenor, G. Monnelly, T. Cline, J. G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams; G. Ricker, J-L Atteia, N. Kawai, D. Lamb, and S. Woosley on behalf of the HETE Science Team; M. Boer, J-F Olive, J-P Dezalay, C. Barraud and K. Hurley on behalf of the HETE FREGATE Team; write: At 09:59:18.85 UTC (35958.85 s UT) on 18 April 2003, the HETE FREGATE and WXM instruments detected event H2686, a long, X-ray-rich GRB. The burst triggered FREGATE in the 30-400 keV energy band. The WXM flight localization was correct and was reported in a GCN Notice at 10:02:54 UTC, 215 sec after the beginning of the burst. Ground analysis of the WXM data produced a refined location, which was reported in a GCN Notice at 11:43:01 UTC, 104 minutes after the beginning of the burst. The WXM ground localization SNR was 9. The WXM localization can be expressed as a 90% confidence circle that is 9 arcminutes in radius and is centered at: R.A. = 10h 54m 53s, Dec. = -06d 59' 22" (J2000). The SXC was off because of illumination by the full moon. The T_90 duration of the burst in the 30-400 keV band was ~ 135 s. The fluence of the burst was ~ 1.2 x 10^-6 erg cm^-2 in the 2-25 keV energy band and ~ 2.5 x 10^-6 erg cm^-2 in the 30-400 keV energy band; thus S(2-25)/S(30-400 keV) ~ 0.5. Therefore this burst is an X-ray-rich GRB. A light curve and skymap for GRB030418 is provided at the following URL: http://space.mit.edu/HETE/Bursts/GRB030418 //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2216 SUBJECT: GRB030418, BVRcIc field photometry DATE: 03/05/07 16:31:40 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 at the coordinates of the optical transient (Price et al. GCN 2148) for the HETE burst GRB030418 (H2686; Shirasaki et al. GCN 2210) with the USNOFS 1.0-m telescope on one marginal night. Stars brighter than V=13.5 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/grb030418.dat The astrometry in this file is based on linear plate solutions with respect to UCAC2. The external errors are less than 100mas. Due to drifting smoke from prescribed forest fires, the external photometric error is potentially larger than normal. We will acquire additional photometry in the next week or so to reduce the external error. 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: 2236 SUBJECT: GRB 030418: Second Epoch Optical Observations with Magellan DATE: 03/05/20 03:12:39 GMT FROM: George Ricker at MIT GRB 030418: Second Epoch Optical Observations with Magellan A. Dullighan, N. R. Butler, G. R. Ricker, J. L. Elliot, K. Clancy (MIT), and D. Osip (Las Campanas Observatory) report: On 2003 April 25.00 UT, we observed the optical afterglow (Price et al; GCN2148) of the HETE-localized GRB 030418 (Shirasaki et al; GCN2210) with the Magellan 6.5 meter Clay telescope at Las Campanas Observatory in Chile. Our observations consisted of two 400s R-Band images, one 400s I-Band image, and one 400s V-Band image taken with the MagIC instrument. The afterglow declined in brightness with respect to our previous measurements (Dullighan et al; GCN2168). The R band data is consistent with a revised power law decay index = 1.2 +/- 0.1, when the two data points from Price et al. (GCN2148 and GCN2150) are included. The afterglow was still point-like, but very close to the limiting magnitudes of the images. No evidence of a host galaxy is observed. We can, however, place a limit on the redshift of the afterglow of z<~5, due to the small V-R color difference we observe (i.e., no evidence for a Lyman alpha break). Our second epoch results were as follows: UT t-t0 (days) Mag 2003-04-25.00 6.58 R=24.9 +/- 0.4 2003-04-25.01 6.59 I>24 (limiting magnitude) 2003-04-25.02 6.60 V=25.1 +/- 0.5 The magnitudes reported above are referenced to the photometry reported by A. Henden (GCN2216). We have also recalibrated the magnitudes we reported in GCN 2168 to A. Henden's photometry (GCN2216). The errors in calculating relative magnitudes have now been taken into account. Our revised first epoch results are as follows: UT t-t0 (days) Mag (Original) Mag (Revised) 2003-04-21.02 2.60 R=23.64 +/- 0.07 R=23.3 +/- 0.1 2003-04-21.03 2.61 I=22.60 +/- 0.05 I=23.0 +/- 0.1 This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2284 SUBJECT: GRB030418: R optical observations DATE: 03/06/17 17:00:55 GMT FROM: Graziella Pizzichini at IASF/CNR,Bologna P. Ferrero and G. Pizzichini (IASF-CNR, Bologna), C. Bartolini, A. Guarnieri, A. Piccioni (Bologna University), and A. De Blasi (Bologna Astronomical Observatory) report: On 2003, April 18 we observed the optical afterglow of HETE GRB 030418 (Shirasaki et al., GCN 2210, Price et al., GCN 2148) with the 152 cm telescope in Loiano in V, Rc and I. Using the star at RA 163.623207 Dec -7.039357 , R = 19.852 +/- 0.245 reported by Henden (GCN 2216), in unfavorable conditions due to the moon, we obtained the following R magnitudes: exp time starting time (UT) mag (2 X 600 sec, co-added) 19:31:05 and 19:44:50 R = 20.50 +/- 0.30 (2 X 600 sec, co-added) 20:10:03 and 20:23:05 R = 20.65 +/- 0.29 Our images in .jpg form can be retrieved by sftp using hostname: ermione.bo.astro.it username: publicGRB password: GRB_bo where a log of our recent observations of GRBs error boxes and OTs in Loiano can also be found. We plan to update it by adding the list of previous observations. This message may be cited.