GRB210504A

This page lists all entries on GRB210504A in GRBweb

Summary IPN Swift GCN 29929 GCN 29930 GCN 29932 GCN 29933 GCN 29934 GCN 29936 GCN 29937 GCN 29939 GCN 29942 GCN 29944 GCN 29946 GCN 30027

Summary table
Variable Value Source
T0 13:54:53 UTC Swift
ra 222.3918° Swift
decl -30.5339° Swift
pos_error 7.77e-05° Swift
T90 135.06 s Swift
T90_start 13:54:53 UTC Swift
fluence 2.70e-06 erg/cm² Swift
redshift 2.0770 GCN_circulars,Optical
T100 135.06 s
GBM_located False
mjd 59338.579780092594 Swift
IPN table
GRB_name GRB210504A
ra 222.2958°
decl -30.5333°
pos_error 5.00e-02°
redshift 2.0770
Swift table
GRB_name GRB210504A
t_trigger 13:54:53 UTC
ra 222.3918°
decl -30.5339°
pos_error 7.77e-05°
T90 135.06 s
fluence 2.70e-06 erg/cm²
redshift 2.0770
GCN 29929 table
GRB_name GRB210504A
GCN_number 29929
Detection_method Swift Det
t_trigger 13:58:28 UTC
ra 222.3933°
decl -30.5322°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29929 SUBJECT: GRB 210504A: Swift detection of a burst DATE: 21/05/04 14:39:18 GMT FROM: Phil Evans at U of Leicester A. P. Beardmore (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), B. Sbarufatti (PSU) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: Swift Burst Alert Telescope (BAT) triggered and located GRB 210504A (trigger=1046782), with the trigger time most likely between 13:40 and 13:58 UT. No BAT information is available at this moment. XRT began observing the field of the new trigger at 13:58:28 UT. In a promptly-downlinked image we find an X-ray source at RA,Dec = 222.3933, -30.5322 which is equivalent to RA (J2000) = 14:49:34.4 Dec (J2000) = -30:31:56 with an estimated uncertainty of about 10". We currently have very limited data products and are awaiting the full data after a ground station pass to further characterise this object. UVOT took a finding chart exposure of ​150 seconds with the ​white filter. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for extinction in the Milky Way. Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk). 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/)
GCN 29930 table
GRB_name GRB210504A
GCN_number 29930
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 29930 SUBJECT: GRB 210504A: update on the BAT trigger time and burst duration DATE: 21/05/04 17:11:37 GMT FROM: Amy Lien at GSFC A. Y. Lien (GSFC/UMBC), A. P. Beardmore (U Leicester), and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team: We received further data from recent telemetry downlink. The trigger time for GRB 210504A (Swift trigger #1046782; Beardmore et al., GCN Circ. 29929) is 2021-05-04T13:54:53 UTC. Based on currently available data from T-60 to T+63 sec, the burst duration is longer than 50 seconds.
GCN 29932 table
GRB_name GRB210504A
GCN_number 29932
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29932 SUBJECT: GRB 210504A: BOOTES-4/MET optical upper limit DATE: 21/05/04 20:17:35 GMT FROM: Youdong HU at IAA-CSIC Y.-D. Hu, T.-R. Sun, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, M. A. Castro Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), S. Guziy (Univ. of Nikolaev) and D. R. Xiong, Y. F. Fan, J. M. Bai, C. J. Wang, Y. X. Xin, X. H. Zhao (Yunnan Observatories of CAS) on behalf of a larger collaboration, report: Following the detection of GRB 210504A by Swift (Beardmore et al. GCNC 29929), we triggered the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) in order to follow up this burst, starting on May 4, 16:05 UT (~2.2 hr after the BAT trigger, according to Lien et al. GCNC 29930). No optical source is detected within the XRT error box (Beardmore et al. GCNC 29929) down to 19.1 mag in the co-added image (630 s in total, clear filter). This non-detection is consistent with the UVOT (Beardmore et al. GCNC 29929) and MASTER (Lipunov et al. GCNC 29931) limits. We thank the staff at Lijiang observatory for their excellent support.
GCN 29933 table
GRB_name GRB210504A
GCN_number 29933
Detection_method Swift-UVOT Det
ra 222.3918°
decl -30.5339°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29933 SUBJECT: GRB 210504A: Swift/UVOT Detection DATE: 21/05/04 20:42:29 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (UCL-MSSL) and A. P. Beardmore (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210504A 218 s after the BAT trigger (Beardmore et al., GCN Circ. 29929). A fading source is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 14:49:34.03 = 222.39179 (deg.) Dec (J2000) = -30:32:02.2 = -30.53395 (deg.) with an estimated uncertainty of 0.6 arc sec. (radius, 90% confidence). 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 218 368 147 19.75 0.19 white 1168 1877 97 20.08 0.31 v 374 739 58 >18.26 b 473 837 58 >19.29 b 1144 1852 97 19.17 0.25 u 448 812 58 >18.89 uvw1 424 788 58 >18.49 uvm2 399 418 20 >17.24 uvw2 523 1040 59 >18.60
GCN 29934 table
GRB_name GRB210504A
GCN_number 29934
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29934 SUBJECT: GRB 210504A: AST3-3 YaoAn Optical Upper Limit DATE: 21/05/04 22:44:24 GMT FROM: Tianrui Sun at Purple Mountain Obs,CAS Tianrui Sun(Purple Mountain Observatory), Lei Hu, Maokai Hu, Xuefeng Wu, Lei Liu, Kelai Meng, Xiaoyan Li(Nanjing Institute of Astronomical Observation Technology), Zhengyang Li, Xiangyan Yuan, Lifan Wang(TAMU), Xiaofeng Wang (Tsinghua University), report on behalf the AST3 Team: Following the detection of GRB 210504A by Swift (Beardmore et al. GCNC 29929), we use Antarctic Survey Telescope 3-3 at YaoAn Astronomy Observation (China, Yunnan) for follow-up. Our observation started on 2021-05-04T16:02:29.850 (about 2 hours after the trigger of BAT, according to Lien et al. GCNC 29930). No optical source was detected within the XRT error box down to 21.0 +/- 0.6 mag in the coadded image (total 2100s, g-band). Our non-detection result is consistent with the UVOT (Beardmore et al. GCNC 29929), MASTER (Lipunov et al. GCNC 29931), and the BOOTES-4/ MET (Hu et al. GCNC 29932) limits.
GCN 29936 table
GRB_name GRB210504A
GCN_number 29936
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 29936 SUBJECT: GRB 210504A: MITSuME Akeno optical upper limits DATE: 21/05/04 23:35:54 GMT FROM: Ryohei Hosokawa at Tokyo Institute of Technology R. Hosokawa, K. L. Murata, M. Niwano, N. Ito, H. Takamatsu, Y. Imai, S. Sato, M. Takaku, R. Noto, R. Yamaguchi, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration: We observed the field of GRB 210504A (Beardmore et al. GCN Circular #29929, Lien et al. GCN Circular #29930) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation with a series of 60 sec exposures started at 2021-05-04 14:55:16 UT (1.0 hour after the BAT trigger, Lien et al. GCN Circular #29930). We stacked the images with good conditions. We did not detect any uncatalogued sources within the XRT error circle (Beardmore et al. GCN Circular #29929) in all three bands. We obtained the 5-sigma limits of the stacked images as follows. T0+[hour] MID-UT T-EXP[sec] 5-sigma limits ------------------------------------------------------------------------------------------------ 1.1 2021-05-04 15:01 300 g’>15.9, Rc>16.2, Ic>15.9 2.8 2021-05-04 16:42 2580 g’>18.3, Rc>18.7, Ic>18.3 ------------------------------------------------------------------------------------------------ T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used the PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).
GCN 29937 table
GRB_name GRB210504A
GCN_number 29937
Detection_method Optical
ra 222.3918°
decl -30.5341°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29937 SUBJECT: GRB 210504A: NOT optical afterglow detection DATE: 21/05/05 00:15:45 GMT FROM: Daniel Perley at Liverpool JMU K. E. Heintz (Univ. of Iceland and DAWN/NBI), D. A. Perley (LJMU), D. B. Malesani (DTU Space), and A. A. Djupvik (NOT) report on behalf of a larger collaboration: We observed the location of the optical and X-ray afterglow of GRB 210504A (Beardmore et al., GCN 29929; Breeveld & Beardmore, GCN 29933) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. We obtained 3x300 s frames in the Sloan r-band filter, followed by 5x200s frames in the z-band filter. Observations were carried out on 2021-05-04 UT between 23:10 and 23:35 (9.3 hours after the BAT trigger time given by Lien et al. (GCN 29930). The optical afterglow is detected in the combined images. We report a refined position (J2000) of: RA: 14:49:34.04 Dec: -30:32:02.6 No source is visible at this location in Pan-STARRS reference imaging. The r-band magnitude of the afterglow at the time of the observation is measured to be 20.95 +/- 0.05. DisclaimerNone
GCN 29939 table
GRB_name GRB210504A
GCN_number 29939
Detection_method Swift-BAT Det
ra 222.3790°
decl -30.5570°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29939 SUBJECT: GRB 210504A: Swift-BAT refined analysis DATE: 21/05/05 02:27:49 GMT FROM: Amy Lien at GSFC S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), J. R. Cummings (CPI), H. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210504A (trigger #1046782) (Beardmore et al., GCN Circ. 29929). The BAT ground-calculated position is RA, Dec = 222.379, -30.557 deg which is RA(J2000) = 14h 49m 31.0s Dec(J2000) = -30d 33' 23.5" with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 53%. The mask-weighted light curve shows several overlapping pulses that start at ~T-30 s and end at ~T+150 s. There might be additional burst emission before the GRB came into the BAT FOV at ~T-43 s. T90 (15-350 keV) is 135.06 +- 9.57 sec (estimated error including systematics). The time-averaged spectrum from T-27.55 to T+134.76 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.64 +- 0.13. The fluence in the 15-150 keV band is 2.7 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+87.68 sec in the 15-150 keV band is 0.9 +- 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/1046782/BA/
GCN 29942 table
GRB_name GRB210504A
GCN_number 29942
Detection_method Swift-XRT Other
ra 222.3912°
decl -30.5334°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29942 SUBJECT: GRB 210504A: Swift-XRT refined Analysis DATE: 21/05/05 04:52:24 GMT FROM: Phil Evans at U of Leicester D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB) and A.P. Beardmore report on behalf of the Swift-XRT team: We have analysed 6.7 ks of XRT data for GRB 210504A (Beardmore et al. GCN Circ. 29929), from 218 s to 24.9 ks after the BAT trigger. The data comprise 146 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. Using 2804 s of PC mode data and 3 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 222.39118, -30.53345 which is equivalent to: RA (J2000): 14h 49m 33.88s Dec(J2000): -30d 32' 00.4" with an uncertainty of 2.0 arcsec (radius, 90% confidence). The late-time light curve (from T0+11.6 ks) can be modelled with a power-law decay with a decay index of alpha=1.9 (+/-0.8). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.00 (+0.13, -0.11). The best-fitting absorption column is 1.50 (+0.41, -0.20) x 10^21 cm^-2, consistent with the Galactic value of 1.3 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.11 (+0.25, -0.16) and a best-fitting absorption column of 1.35 (+0.75, -0.06) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.35 (+0.75, -0.06) x 10^21 cm^-2 Galactic foreground: 1.3 x 10^21 cm^-2 Excess significance: <1.6 sigma Photon index: 2.11 (+0.25, -0.16) If the light curve continues to decay with a power-law decay index of 1.9, the count rate at T+24 hours will be 1.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.3 x 10^-14 (4.4 x 10^-14) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01046782. This circular is an official product of the Swift-XRT team.
GCN 29944 table
GRB_name GRB210504A
GCN_number 29944
Detection_method Optical
redshift 2.0770
Circular_text TITLE: GCN CIRCULAR NUMBER: 29944 SUBJECT: GRB 210504A: VLT X-shooter redshift DATE: 21/05/05 07:36:20 GMT FROM: Alexander Kann at IAA-CSIC D. Xu (NAOC), P. Schady (Univ. Bath), K. E. Heintz (Univ. Iceland and DAWN/NBI), D. B. Malesani (DTU Space), B. Sbarufatti (PSU), G. Pugliese (API, Univ. Amsterdam), D. A. Perley (LJMU), V. D'Elia (ASI/SSDC, INAF/OAR), D. A. Kann (HETH/IAA-CSIC), and J. P. U. Fynbo (DAWN/NBI/DTU) report on behalf of the Stargate consortium: We observed the optical afterglow (Breeveld & Beardmore, GCN 29933; Heintz et al., GCN 29937) of GRB 210504A (Beardmore et al., GCN 29929; Lien et al., GCN 29330) using the ESO VLT UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposures of 1200 s each (8 x 600 s in the NIR). The observation mid-time was 2021 May 05.06 UT (11.6 hr after the GRB). In a 60 s image taken with the acquisition camera on May 05.02 UT, we detect the optical afterglow, for which we measure an AB magnitude r' = 21.11 +- 0.04 mag (calibrated against nearby stars from the Pan-STARRS catalog). We clearly detect continuum over the wavelength range of the entire spectrum. A trough is visible around 3740 AA, which we identify as due to H I. From the detection of several absorption features, which we interpret as due to Si II, C II, C IV, Fe II, Al II, Mg II, among others, as well as the Lyman forest, we infer a redshift z = 2.077. We acknowledge excellent support from the observing staff at Paranal, in particular Steffen Mieske, Ditte Slumstrup and Diego Parraguez.
GCN 29946 table
GRB_name GRB210504A
GCN_number 29946
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29946 SUBJECT: GRB 210504A: Lowell Discovery Telescope optical observations DATE: 21/05/05 14:36:48 GMT FROM: Brendan O'Connor at UMD B. O'Connor (UMD, GWU), S.Dichiara (UMD, NASA-GSFC), E. Troja (UMD, NASA-GSFC), P. Gatkine (Caltech), J.M. Durbak (UMD), S.B. Cenko (NASA-GSFC), A. Kutyrev (UMD, NASA-GSFC), S. Veilleux (UMD) report: We observed the field of the GRB 210504A (Beardmore et al., GCN 29929; Lien et al., GCN 29930) using the Large Monolithic Imager (LMI) on the 4.3m Lowell Discovery Telescope (LDT) at Happy Jack, AZ. Observations started on May 5, 2021 at 06:32:14 UT (about 16.6 hours after the Swift trigger) using the SDSS g, r, i, and z filters. Observations were taken at an airmass of 2.5 and seeing of about 1.5". We detect the optical counterpart identified by the Swift/UVOT (Breeveld et al., GCN 29933), the NOT (Heintz et al., GCN 29937), and VLT (Xu et al., GCN 29944). The afterglow has magnitude r ~ 21.66 +/- 0.04 AB mag and i ~ 21.43 +/- 0.03 AB mag. Magnitudes are calibrated against the PanSTARRS catalog and are not corrected for Galactic extinction. We thank the staff of the Lowell Discovery Telescope for assistance with these observations.
GCN 30027 table
GRB_name GRB210504A
GCN_number 30027
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30027 SUBJECT: GRB 210504A: LCO Optical Afterglow Detection DATE: 21/05/16 17:00:44 GMT FROM: Robert Strausbaugh at U. of the Virgin Islands R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration: We observed Swift GRB 210504A (Beardmore, et al., GCN 29929) with the LCO 1-m Sinistro instrument at the South African Astronomical Observatory site, on May 5, from 18:49 to 18:56 UT (corresponding to 4.92 to 5.03 hours from the GRB trigger time) with the Bessel R filter. We performed a series of 3x180s exposures in R. We detect an uncatalogued optical source in the coadded images consistent with the UVOT position (Breeveld, et al., GCN 29933). Using the USNO-B.1 catalog as reference, we calculate the following magnitude: R=20.29+/-0.18 These magnitudes are not corrected for galactic extinction. R.S. is funded by NSF AST grant #1831682