GRB120404A

This page lists all entries on GRB120404A in GRBweb

Summary IPN Swift GCN 13208 GCN 13209 GCN 13210 GCN 13211 GCN 13213 GCN 13217 GCN 13218 GCN 13220 GCN 13221 GCN 13222 GCN 13224 GCN 13225 GCN 13226 GCN 13227 GCN 13228 GCN 13229 GCN 13230 GCN 13231 GCN 13232 GCN 13233 GCN 13234 GCN 13235 GCN 13236

Summary table
Variable Value Source
T0 12:51:02 UTC GCN_circulars,Swift Det
ra 235.0095° Swift
decl 12.8851° Swift
pos_error 8.41e-05° Swift
T90 38.7 s Swift
T90_start 12:51:02 UTC Swift
fluence 1.60e-06 erg/cm² Swift
redshift 2.8760 GCN_circulars,Swift-UVOT Det
T100 38.7 s
GBM_located False
mjd 56021.53543981481 GCN_circulars,Swift Det
IPN table
GRB_name GRB120404A
ra 235.0125°
decl 12.8833°
pos_error 5.00e-02°
redshift 2.8760
Swift table
GRB_name GRB120404A
t_trigger 12:51:02 UTC
ra 235.0095°
decl 12.8851°
pos_error 8.41e-05°
T90 38.7 s
fluence 1.60e-06 erg/cm²
redshift 2.8760
GCN 13208 table
GRB_name GRB120404A
GCN_number 13208
Detection_method Swift Det
t_trigger 12:51:02 UTC
ra 235.0120°
decl 12.8820°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13208 SUBJECT: GRB 120404A: Swift detection of a burst with an optical counterpart DATE: 12/04/04 13:01:42 GMT FROM: Scott Barthelmy at NASA/GSFC G. Stratta (ASDC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), V. D'Elia (ASDC), P. A. Evans (U Leicester), C. Guidorzi (U Ferrara), S. T. Holland (STScI), E. A. Hoversten (PSU), J. A. Kennea (PSU), A. Y. Lien (NASA/GSFC/ORAU), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), C. Pagani (U Leicester), K. L. Page (U Leicester), P. Romano (INAF-IASFPA), R. L. C. Starling (U Leicester), M. C. Stroh (PSU) and B.-B. Zhang (PSU) report on behalf of the Swift Team: At 12:51:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120404A (trigger=519380). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 235.012, +12.882 which is RA(J2000) = 15h 40m 03s Dec(J2000) = +12d 52' 54" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single symmetric peak with a duration of about 35 sec. The peak count rate was ~1800 counts/sec (15-350 keV), at ~5 sec after the trigger. The XRT began observing the field at 12:53:12.4 UT, 130.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 235.00884, 12.88446 which is equivalent to: RA(J2000) = 15h 40m 02.12s Dec(J2000) = +12d 53' 04.1" with an uncertainty of 4.1 arcseconds (radius, 90% containment). This location is 14 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 3.42 x 10^20 cm^-2 (Kalberla et al. 2005). The initial flux in the 2.5 s image was 7.34e-10 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 138 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 15:40:02.29 = 235.00956 DEC(J2000) = +12:53:06.3 = 12.88508 with a 90%-confidence error radius of about 0.65 arc sec. This position is 4.6 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.37 with a 1-sigma error of about 0.16. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05. Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN 13209 table
GRB_name GRB120404A
GCN_number 13209
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13209 SUBJECT: GRB 120404A: Faulkes Telescope North afterglow confirmation DATE: 12/04/04 13:13:33 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), J. Japelj (U. Ljubljana) on behalf of a larger collaboration report: "The 2-m Faulkes Telescope North robotically followed up GRB 120404A (Stratta et al., GCN Circ. 13208) at 12:55:03 UT, corresponding to 4 min after the GRB trigger time. We clearly detect the optical afterglow candidate by Swift-UVOT (GCN 13208) with a magnitude of 18.8 +- 0.3 in the R filter in a 10-s exposure frame, calibrated against nearby USNOB-1 field stars.
GCN 13210 table
GRB_name GRB120404A
GCN_number 13210
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13210 SUBJECT: GRB 120404A: MASTER early OT limit DATE: 12/04/04 13:24:31 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, A.Kuznetsov, A.Sankovich Moscow Lomonosov State University, Sternberg Astronomical Institute, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnich, A. Popov, A. Bourdanov, A. Punanova Ural Federal University Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB120404A 24 sec s after notice time and 71 sec after GRB time at 2012-04-04 12:52:13.917 UT. On our first (10s exposure) set we haven't found optical transient within SWIFT error-box (Stratta et al., GCN 13208). The GRB was at 15 degrees under horizont. The 5-sigma upper limit has been about 15.3 mag. The message may be cited. The message may be cited.
GCN 13211 table
GRB_name GRB120404A
GCN_number 13211
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 13211 SUBJECT: GRB 120404A: MITSuME Akeno Optical upper limits DATE: 12/04/04 14:51:25 GMT FROM: Yoichi Yatsu at Tokyo Tech. Y. Saito, Y. Aoki, S. Song, M. Hayashi, K. Kawakami, K. Tokoyoda, R. Usui, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed GRB 120404A (Stratta et al., GCN Circular 13208) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. We started the observation 84 sec after the BAT trigger from 2012-04-04 12:52:24.8 UT. And we did not find any new point source within the XRT error circle in the three bands. The results of photometry (3sigma upper limits) are listed below. The photon flux were calibrated against GSC2.3 catalog. T0+[sec] MID-UT T-EXP[sec] g' Rc Ic ---------------------------------------------------------------------------------------------------- 219 12:54:40 270 > 15.4 > 16.1 > 16.7 ---------------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst [sec] T-EXP: Total Exposure time [sec]
GCN 13213 table
GRB_name GRB120404A
GCN_number 13213
Detection_method Swift-BAT Det
redshift 1.6330
Circular_text TITLE: GCN CIRCULAR NUMBER: 13213 SUBJECT: GRB 120404A: Gemini-N Redshift DATE: 12/04/04 15:17:07 GMT FROM: Antonino Cucchiara at UCSC/UCO Lick A. Cucchiara (UCSC/UCO Lick), on behalf of a larger collaboration reports: On April 4.58 UT (~60 minutes after the BAT trigger) we observed the field of GRB 120404A (Stratta et al., GCN 13208) using GMOS Spectrograph on the Gemini-North 8-m telescope. The optical afterglow is clearly detected in our r-band acquisition image. We performed 2x900s spectroscopic observations of the optical afterglow using the B600 grating centered at 6500 Angstrom (covering the range 5100-7900 A). The spectrum reveals several absorption features, including FeII2586,2600, MgII2796,2803 at a common redshift of 1.633. Other features indicate at least one MgII intervening system at z=1.101 We therefore suggest that the redshift of GRB 120404A is z=1.633. We thank the Gemini-North staff for their prompt support.
GCN 13217 table
GRB_name GRB120404A
GCN_number 13217
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 13217 SUBJECT: GRB 120404A: Gemini-N Redshift correction DATE: 12/04/04 18:38:17 GMT FROM: Antonino Cucchiara at UCSC/UCO Lick A. Cucchiara (UCSC/UCO Lick), N.R. Tanvir (U. of Leicester) report on behalf of a larger collaboration: We re-analyzed the GMOS spectra of GRB 120404A presented in GCN 13213. Based on further analysis we report a corrected redshift for the GRB of z=2.876. This new value is based on the identification of SiIV1393,1403, CIV1550,AlIII1855,1963, CII1335, CII*1335, SiII1527, SiII*1533, SiII1808. We note that the CIV1448 line at this redshift is partly covered by the GMOS chip gap. At least four different intervening systems are identified at the following redshifts: z1=2.551 (based on CIV1548,1550 doublet) z2=1.776 (based on MgII2796,2803 doublet) z3=1.633 (based on MgII2796,2803 doublet) z4=1.101 (based on MgII2796,2803 doublet) We encourage further spectroscopic observations and apologize for any inconvenience the previous redshift determination may have caused.
GCN 13218 table
GRB_name GRB120404A
GCN_number 13218
Detection_method Swift-XRT Det
ra 235.0095°
decl 12.8847°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13218 SUBJECT: GRB 120404A: Enhanced Swift-XRT position DATE: 12/04/04 20:47:59 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 852 s of XRT Photon Counting mode data and 1 UVOT images for GRB 120404A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 235.00951, +12.88471 which is equivalent to: RA (J2000): 15h 40m 2.28s Dec (J2000): +12d 53' 04.9" with an uncertainty of 1.6 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 13220 table
GRB_name GRB120404A
GCN_number 13220
Detection_method Swift-BAT Det
ra 235.0020°
decl 12.8830°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13220 SUBJECT: GRB 120404A: Swift-BAT refined analysis DATE: 12/04/05 00:40:32 GMT FROM: Scott Barthelmy at NASA/GSFC T. N. Ukwatta (MSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), G. Stratta (ASDC), J. Tueller (GSFC) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120404A (trigger #519380) (Strata, et al., GCN Circ. 13208). The BAT ground-calculated position is RA, Dec = 235.002, 12.883 deg, which is RA(J2000) = 15h 40m 00.4s Dec(J2000) = +12d 52' 57.3" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 49%. The mask-weighted light curve shows several overlapping peaks starting at ~T-20 sec, peaking at ~T+4 sec, and ending at ~T+80 sec. T90 (15-350 keV) is 38.7 +- 4.1 sec (estimated error including systematics). The time-averaged spectrum from T-7.31 to T+38.45 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.85 +- 0.13. The fluence in the 15-150 keV band is 1.6 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+3.29 sec in the 15-150 keV band is 1.2 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/519380/BA/
GCN 13221 table
GRB_name GRB120404A
GCN_number 13221
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13221 SUBJECT: GRB 120404A : TNT optical observation DATE: 12/04/05 00:44:27 GMT FROM: L.P. Xin at NAOC L.P. Xin, J. Y.Wei, Y.L. Qiu, J. Wang, J.S. Deng, C. Wu, X. H. Han on behalf of EAFON report: We began to observe GRB 120404A (Stratta et al., GCN Circ. 13208) with Xinglong TNT telescope in R-band at 19:33:05(UT), 6.7 hours after the burst. The optical counterpart (Stratta et al., GCN Circ. 13208, Guidorzi et al. GCN Circ. 13209) was marginal detected with a brightness of 20.3 +/- 0.2 mag calibrated to USNO B1.0 R2 mag, at the mean time of 7.4 hours after the burst. Combined with the report by Guidorzi et al. ( GCN Circ. 13209 ), the brightness of this burst decayed by 1.5 magnitude in R-band during 4 min and 7.4 hour after the burst, corresponding to a shallow decay index of about 0.3 during this phase. Further observations are encouraged. This message may be cited. For more information about Xinglong GRBs Follow-up observations, please visit the website: http://www.xinglong-naoc.org:8080/grb/index.html We thank Liang Ma for performing these observations.
GCN 13222 table
GRB_name GRB120404A
GCN_number 13222
Detection_method Swift-XRT Other
redshift 2.8700
Circular_text TITLE: GCN CIRCULAR NUMBER: 13222 SUBJECT: GRB 120404A: Swift-XRT refined Analysis DATE: 12/04/05 01:02:05 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester) and G. Stratta report on behalf of the Swift-XRT team: We have analysed 7.7 ks of XRT data for GRB 120404A (Stratta et al. GCN Circ. 13208), from 119 s to 23.3 ks after the BAT trigger. The data comprise 109 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 13218). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=2.15 (+0.18, -0.17). At T+544 s the decay flattens to an alpha of 0.1 (+0.4, -0.6) before breaking again at T+2930 s to a final decay with index alpha=1.83 (+0.21, -0.19). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.72 (+0.14, -0.13). The best-fitting absorption column is 2.3 (+4.7, -2.3) x 10^21 cm^-2, at a redshift of 2.87, in addition to the Galactic value of 3.4 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.90 (+/-0.12) and a best-fitting absorption column of 4.5 (+4.3, -4.0) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Galactic foreground: 3.4 x 10^20 cm^-2 Intrinsic column: 4.5 (+4.3, -4.0) x 10^21 cm^-2 at z=2.87 Photon index: 1.90 (+/-0.12) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00519380. This circular is an official product of the Swift-XRT team.
GCN 13224 table
GRB_name GRB120404A
GCN_number 13224
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 13224 SUBJECT: GRB 120404A: MITSuME Okayama Optical Observation DATE: 12/04/05 09:17:14 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 120404A (Stratta et al., GCNC 13208) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2012-04-04 17:41:39 UT (~4.8 h after the burst). We detected the previously reported afterglow (Guidorzi et al., GCNC 13209) in Rc and Ic bands. Photometric results of the OT are listed below. We used SDSS catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' Rc Rc_err Ic Ic_err ---------------------------------------------------------------------- 0.24381 18:42:07 5760.0 >20.4 20.2 0.3 19.1 0.2 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 13225 table
GRB_name GRB120404A
GCN_number 13225
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 13225 SUBJECT: GRB 120404A: MITSuME Ishigakijima Optical Observation DATE: 12/04/05 09:17:32 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 120404A (Stratta et al., GCNC 13208) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory. The observation started on 2012-04-04 14:31:32 UT (~1.7 h after the burst). We detected the previously reported afterglow (Guidorzi et al., GCNC 13209) in only Ic band. Photometric results of the OT are listed below. We used SDSS catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' Rc Ic Ic_err ---------------------------------------------------------------------- 0.09215 15:03:44 1080.0 >18.6 >18.7 17.5 0.2 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 13226 table
GRB_name GRB120404A
GCN_number 13226
Detection_method Swift-UVOT Det
redshift 2.8760
Circular_text TITLE: GCN CIRCULAR NUMBER: 13226 SUBJECT: GRB 120404A: Swift/UVOT Detection DATE: 12/04/05 11:44:46 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (MSSL-UCL) and G. Stratta (ASDC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 120404A 139 s after the BAT trigger (Stratta et al., GCN Circ. 13208). A source at the UVOT position given in Stratta et al., GCN Circ. 13208, and consistent with the enhanced XRT position (Osborne et al., GCN Circ. 13218), is detected in the initial UVOT exposures. The source is only seen in the optical filters and rises initially and then fades. The fact that the source is not detected in the UV filters is consistent with the redshift of z=2.876 reported by Cucchiara et al., GCN Circ. 13217. Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 139 288 147 19.43 0.12 v 4734 4934 197 17.69 0.10 b 606 1178 58 19.22 0.28 u 351 1327 304 19.90 0.19 w1 729 6779 452 >20.3 m2 704 6574 432 >21.5 w2 656 11408 1179 >22.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
GCN 13227 table
GRB_name GRB120404A
GCN_number 13227
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13227 SUBJECT: GRB 120404A: VLT/X-shooter redshift confirmation DATE: 12/04/05 14:05:02 GMT FROM: Valerio D'Elia at ASDC V. D'Elia (INAF-OAR and ASI-ASDC), Paolo Goldoni (APC/U. Paris 7 and SAp/CEA), Daniele Malesani (DARK/NBI), Nial R. Tanvir (U. of Leicester), Johan P. U. Fynbo (DARK/NBI) and Andrea Melandri (INAF-OAB) and report on behalf of a larger collaboration: We observed the optical/NIR afterglow of the Swift GRB 120404A (Stratta et al., GCN 13208; Guidorzi et al., GCN 13209) with the VLT/UT2 equipped with the X-shooter spectrograph. Observations started around 04:30 UT on 2012-04-05, which is roughly 16 hr after the trigger. In the acquisition frame (taken 15.9 hr after the GRB), the afterglow is detected at low S/N. Comparison with two closeby SDSS stars yields R ~ 21.3 (Vega), with a systematic uncertainty of ~0.3 mag. Four exposures in a nodding pattern with an integration time of 2400 s each were obtained in poor sky conditions. The spectrum covers an approximate wavelength range between 3000 and 25000 AA. The slit width was set to 1" in the ultra-violet/blue arm, and 0.9" in the visual and near-infrared arms, resulting in a resolving power range of approximately 4500-7500. Preliminary reduction of the spectrum shows a weak continuum with a trough at ~4720 AA, which we identify as Ly-alpha. We also detect faint absorption lines of OI 1302 and SiIV 1393/1402 at a common redshift of ~2.88. This confirms the redshift determination by Gemini-N (Cucchiara et al., GCN 13217). A second dip matching Lya at z=2.55 is also marginally detected. This is consistent with the CIV intervening absorber reported in Cucchiara et al., GCN 13217. We are grateful for the excellent support from the Paranal Observatory staff, in particular Claudio Melo. We are in debt to Cristiano Guidorzi for providing us a FTN finding chart.
GCN 13228 table
GRB_name GRB120404A
GCN_number 13228
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13228 SUBJECT: GRB120404A: MOA optical observations of the initial rise afterglow DATE: 12/04/05 15:09:11 GMT FROM: Akihiko Fukui at Nagoya U/MOA P. J. Tristram (MJUO), A. Fukui (NAOJ/OAO) and T. Sako (Nagoya U.) report on behalf of the MOA collaboration. We began prompt observations for the afterglow of GRB120404A (Stratta et al., GCN 13208) at Apr. 4 12:55:44 UT (4.7 min after the Swift trigger 519380), using the 61-cm B&C telescope at Mt John University Observatory in New Zealand. We obtained a series of I and V band images with 60 sec exposure times, followed by some 120 and 180 sec exposures, until 18:04 UT (5.2 hours after the trigger). In the first images, we detected marginal objects having I ~ 18.6 and V ~ 19.0 at the reported coordinate of the afterglow (Osborne et al., GCN13218). The afterglow was then getting bright, as reported by Breeveld et al. (GCN 13226), reaching I = 16.6 and V = 17.4 at around 13:40 UT (about 50 min after the trigger). After the peak, the afterglow had faded out with the rate of +0.7 mag/hour. The characteristic magnitudes are summarized as bellow. UT I V ------------------------------------------------------- 12:56 18.6 +2/-0.6 19.0 +1.2/-0.6 13:40 16.6 +/- 0.1 17.4 +/- 0.1 16.50 18.4 +0.6/-0.4 19.5 +0.6/-0.4 ------------------------------------------------------- All the above magnitudes are measured on 60-sec exposure images, and calibrated by the GSC2.3 star catalog. The errors represent 1-sigma statistic uncertainties. We would like to thank Alberto J Castro-Tirado for giving us useful suggestions. We acknowledge University of Canterbury for allowing the use of the B&C telescope.
GCN 13229 table
GRB_name GRB120404A
GCN_number 13229
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 13229 SUBJECT: GRB120404A: GROND observations show steeply decaying afterglow DATE: 12/04/05 15:30:10 GMT FROM: Arne Rau at MPE V. Sudilovsky, A. Rau , J. Greiner (all MPE Garching), report on behalf of the GROND team: We observed the field of GRB120404A (Swift trigger 519380; Stratta et al., GCN #13208) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile). Observations started at 2012-04-05 07:01:16 UT, 18.2 hours after the GRB trigger. The afterglow (e.g., Stratta et al., GCN #13208; Guidorzi et al., GCN #13209) is clearly detected. At mid-time of 19.3 hours post trigger and with an exposure of 20 min we measure the following preliminary SDSS (g'r'i'z') and 2MASS (JHK) calibrated AB magnitudes: g' = 23.2 0.3 r' = 22.6 0.1 i' = 22.3 0.1 z' = 22.0 0.1 J = 21.2 0.3 H = 20.6 0.3 K > 20.0 The SED, corrected for the Galactic foreground reddening of E_(B-V)=0.05 mag (Schlegel et al. 1998) is best fit by a power law with a slope of beta~1.4 and no additional rest frame extinction. The comparison with the MITSuME observation at 4.8 hours post-trigger (Kuroda et al., GCN #13224) and TNT measurement at 7.4 hours post-trigger (Xin et al., GCN #13221) suggests a significant steepening of the afterglow decay. Assuming the decay started around ~7.4 hours post-trigger, we estimate the decay slope to be ~2.2.
GCN 13230 table
GRB_name GRB120404A
GCN_number 13230
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13230 SUBJECT: GRB 120404A: MASTER OT observations DATE: 12/04/06 16:00:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, A.Kuznetsov,A.Sankovich Moscow Lomonosov State University, Sternberg Astronomical Institute, V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnich, A. Popov, A. Bourdanov, A. Punanova Ural Federal University Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB120404A 24 sec after notice time and 71 sec after GRB time at 2012-04-04 12:52:13.917 UT (Yurkov et al., GCN 13210). The observations was made with a full moon and at high zenith distance. We see an OT (G. Stratta et. al., GCN 13208) on 3 single and some coadd images. First time the OT seen at coadd of six first images set with magnitude about 16.8. After this time the object was decay below 17.5 mag for an hour. The OT have a flash to 16.9 mag in our unfiltered band (0.8R+0.2B) ~ 1 h after trigger time. The detail imformation about observations in a table 1. Table 1. T_mid UT | T-T_grb sec.| Exptime | Coadd | Mag | err.mag ---------+-------------+---------+--------+------+-------- 12:55:25 | 263 | 180 | 6 | 16.8 | 0.3 13:46:14 | 3311 | 180 | 1 | 17.2 | 0.4 13:49:40 | 3517 | 180 | 1 | 16.9 | 0.4 13:56:33 | 3930 | 180 | 1 | 17.1 | 0.4 14:10:22 | 4760 | 900 | 5 | 17.8 | 0.3 14:36:13 | 6311 | 1800 | 10 | 18.1 | 0.3 15:21:03 | 9001 | 1800 | 10 | 18.2 | 0.3 ---------------------------------------------------------- The message may be cited.
GCN 13231 table
GRB_name GRB120404A
GCN_number 13231
Detection_method VLA Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 13231 SUBJECT: GRB 120404A: EVLA Detection DATE: 12/04/06 20:55:35 GMT FROM: Ashley Zauderer at CfA Ashley Zauderer, Tanmoy Laskar and Edo Berger (Harvard) report: "We observed the position of GRB 120404A (GCN 13208) with the EVLA at 22 GHz beginning 2012 Apr 5.27 UT (0.75 d after the burst). We detect a source at 22 GHz consistent with the Swift-XRT (GCN 13218) and the UVOT position (GCN 13208) with a flux of 82 uJy (+/- 22 uJy). The position of the radio source is RA 15:40:02.28 (+/- 0.01) DEC +12:53:06.1 (+/- 0.1) The source was not detected at 6 GHz (3-sigma upper limit of 33 uJy)."
GCN 13232 table
GRB_name GRB120404A
GCN_number 13232
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13232 SUBJECT: GRB 120404A: SMARTS optical/IR observations DATE: 12/04/06 21:07:50 GMT FROM: Bethany Cobb at GWU B. E. Cobb (GWU) reports: Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 120404A (GCN 13208, Stratta et al.) with a mid-exposure time of 17.4 hours post-burst (2012-04-05 06:13 UT). Total summed exposure times amounted to 36 minutes in I and 30 minutes in J. No source is detected at the position of the optical afterglow (e.g. GCN 13208, Stratta et al.; GCN 13209, Guidorzi et al.) to approximate limiting magnitudes of I > 21.6 and J > 19.6. Magnitudes are calibrated using USNO-B1.0 stars in I, and 2MASS stars in J.
GCN 13233 table
GRB_name GRB120404A
GCN_number 13233
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13233 SUBJECT: GRB 120404A: JCMT SCUBA-2 sub-mm observation DATE: 12/04/06 21:32:06 GMT FROM: Ian Smith at Rice U I.A. Smith (Rice U.), R.P.J. Tilanus (JAC), N.R. Tanvir (U. of Leicester), D.A. Frail (NRAO) report: We observed the counterpart to GRB 120404A (Stratta et al., GCN Circ. 13208) using the SCUBA-2 sub-millimeter continuum camera on the James Clerk Maxwell Telescope. The observation started at 13:50 UT on 2012-04-04, corresponding to 59 minutes after the burst trigger. Exposures totaling one hour were made in marginal weather conditions. No source was detected, with a preliminary RMS of 4.1 mJy at 850 microns. We thank William Montgomerie for his prompt support of these observations.
GCN 13234 table
GRB_name GRB120404A
GCN_number 13234
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13234 SUBJECT: GRB 120404A, Optical Observations DATE: 12/04/07 09:01:17 GMT FROM: Shashi Bhushan Pandey at ROTSE Brajesh Kumar, Vijay Kumar Bhatt and S.B. Pandey (ARIES, Nainital, India, on behalf of larger Indian GRB collaboration) We started to observe the GRB 120404A field (Swift trigger 519380, Stratta et al., GCN Circ. 13208) with the 1.04m telescope at ARIES, Nainital starting 2012-04-04 19:18:43 (UT). Several images in R_c and I_c pass-bands were obtained. The optical afterglow candidate (Stratta et al., GCN Circ. 13208, Guidorzi et al. GCN Circ. 13209) was clearly detected in our frames. The preliminary photometry of co-added R_c (300sec x 4) and I_c (300sec x 3) frames yield the following magnitudes. ............................................................... Time (MID-UT) Exp (sec) Filter Magnitude ............................................................... 19:39:40 1200 R_c 20.6 +/- 0.14 19:51:22 900 I_c 19.7 +/- 0.12 ............................................................... The nearby USNO stars have been used for calibration. This massage may be cited.
GCN 13235 table
GRB_name GRB120404A
GCN_number 13235
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13235 SUBJECT: GRB 120404A: optical observations DATE: 12/04/07 22:40:19 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (SAI MSU), D. Varda (ISON), E. Sinyakov (ISON), E. Litvinenko (UBAI), V. Kouprianov (GAO), I. Molotov (KIAM), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the field of the Swift GRB 120404A (Stratta et al., GCN 13208) with ORI-25 (0.25-m) telescope of ISON-Blagoveschensk observatory between Apr. 04 (UT) 13:06:10 - 14:43:45 and ORI-40 (0.4-m) telescope of ISON-Kitab observatory between Apr. 04 (UT) 17:13:02 - 18:16:58. Several unfiltered images were taken in both observatories. We detected optical afterglow (Stratta et al., GCN 13208; Guidorzi et al., GCN 13209) in combined image (see below). Coordinates of the OT are (J2000) 15:40:02.17, +12:53:06.5 with unceraininty of 0.75" on both coordinates which is compatible with coordinates reported by UVOT team (Stratta et al., GCN 13208). A photometry is based on nearby USNO-B1.0 stars (R2 magnitude): t_start, t-t0 (mid), filter exp., OT, UL (UT) d s 13:06:10 0.01529 none 12x25 n/d 16.5 13:21:11 0.03700 none 38x25 17.35 +/- 0.25 17.5 14:08:43 0.06611 none 29x25 n/d 17.9 17:13:02 0.20378 none 60x60 n/d 18.9 Based on initially non-detection of the OT we can confirm the brightening of the afterglow (Breeveld et al., GCN 13226; Tristram et al., GCN 13228; Gorbovskoy et al., GCN 13230) with a peak between (UT) 13:21 and 14:06 (i.e. ~ 50 min after burst trigger).
GCN 13236 table
GRB_name GRB120404A
GCN_number 13236
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13236 SUBJECT: GRB 120404A: optical observations in Mondy observatory DATE: 12/04/08 14:58:38 GMT FROM: Alexei Pozanenko at IKI, Moscow A.Volnova (SAI MSU), E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the field of the Swift GRB 120404A (Stratta et al., GCN 13208) with AZT-33IK telescope of Sayan observatory (Mondy). We took several images in R-filter of 60 s exposure on Apr. 04, starting (UT) 14:31:21. We clearly detected optical afterglow (Stratta et al., GCN 13208; Guidorzi et al., GCN 13209) in single images. A preliminary photometry of combined images is based on nearby USNO-B1.0 stars: t_start, t-t0 (mid), filter exp., OT, err (UT) d s 14:31:21 0.07142 R 5x60 18.24 0.05 14:37:26 0.07564 R 5x60 18.36 0.04 14:42:30 0.07916 R 5x60 18.40 0.05 14:47:34 0.08268 R 5x60 18.36 0.07 14:52:37 0.08619 R 5x60 18.59 0.07 14:58:42 0.09041 R 5x60 18.59 0.04 15:03:46 0.09393 R 5x60 18.77 0.12 15:08:50 0.09920 R 10x60 18.76 0.06 15:19:58 0.10694 R 10x60 18.95 0.06 15:30:06 0.11432 R 10x60 18.94 0.08 15:41:14 0.12171 R 10x60 19.00 0.08 15:51:21 0.12908 R 10x60 19.30 0.09 Our photometry suggests bumpy light curve of the afterglow during our observations.