GRB230228A

This page lists all entries on GRB230228A in GRBweb

Summary Fermi GBM IPN Swift GCN 33378 GCN 33379 GCN 33380 GCN 33381 GCN 33382 GCN 33383 GCN 33384 GCN 33387 GCN 33389 GCN 33392 GCN 33393 GCN 33394 GCN 33426 GCN 33436 GCN 33557

Summary table
Variable Value Source
GRB_name_Fermi GRB230228244
T0 5:50:50 UTC GCN_circulars,Swift Det
ra 18.3781° Swift
decl 44.4829° Swift
pos_error 2.72e-04° Swift
T90 2.304 s Fermi_GBM
T90_error 1.088 s Fermi_GBM
T90_start 5:50:50.297 UTC Fermi_GBM
fluence 5.06e-07 erg/cm² Fermi_GBM
fluence_error 4.40e-08 erg/cm² Fermi_GBM
T100 2.601 s
GBM_located False
mjd 60003.24363425926 GCN_circulars,Swift Det
Fermi GBM table
GRB_name_Fermi GRB230228244
trigger_name bn230228244
ra 18.3779°
decl 44.4831°
datum 2023-02-28
t_trigger 5:50:51.193 UTC
T90 2.304 s
T90_error 1.088 s
T90_start 5:50:50.297 UTC
fluence 5.06e-07 erg/cm²
fluence_error 4.40e-08 erg/cm²
flux_1024 4.13e+00 erg/cm²/s
flux_1024_error 3.11e-01 erg/cm²/s
flux_1024_time -7.68e-01 erg/cm²/s
flux_64 6.04e+00 erg/cm²/s
flux_64_error 1.48e+00 erg/cm²/s
IPN table
GRB_name GRB230228A
ra 18.4042°
decl 44.4833°
pos_error 5.00e-02°
Swift table
GRB_name GRB230228A
t_trigger 5:50:50 UTC
ra 18.3781°
decl 44.4829°
pos_error 2.72e-04°
T90 2.18 s
fluence 3.60e-07 erg/cm²
GCN 33378 table
GRB_name GRB230228A
GCN_number 33378
Detection_method Swift Det
t_trigger 5:50:50 UTC
ra 18.4030°
decl 44.4890°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33378 SUBJECT: GRB 230228A: Swift detection of a possibly short burst DATE: 23/02/28 06:03:29 GMT FROM: David Palmer at LANL S. Dichiara (PSU), J.D. Gropp (PSU), D. M. Palmer (LANL) and T. M. Parsotan (GSFC/UMBC/CRESSTII) report on behalf of the Neil Gehrels Swift Observatory Team: At 05:50:50 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230228A (trigger=1156572). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 18.403, +44.489 which is RA(J2000) = 01h 13m 37s Dec(J2000) = +44d 29' 19" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single symmetrical peak structure with a duration of about 1.5 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 05:52:49.2 UT, 119.0 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 18.37776, 44.48321 which is equivalent to: RA(J2000) = 01h 13m 30.66s Dec(J2000) = +44d 28' 59.6" with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 68 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 https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 9.72 x 10^20 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 122 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 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 the expected extinction corresponding to E(B-V) of 0.085. Burst Advocate for this burst is S. Dichiara (simonedichiara55 AT gmail.com). 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 33379 table
GRB_name GRB230228A
GCN_number 33379
Detection_method Swift-XRT Other
ra 18.3780°
decl 44.4829°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33379 SUBJECT: GRB 230228A: Prompt enhanced Swift-XRT position DATE: 23/02/28 06:35:05 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using promptly downlinked XRT event data for GRB 230228A, we find an enhanced XRT position of the afterglow: RA, Dec: 18.37804, 44.48289 which is equivalent to: RA (J2000) = 01 13 30.73 Dec (J2000) = +44 28 58.4 with an uncertainty of 1.9 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/1156572. Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team.
GCN 33380 table
GRB_name GRB230228A
GCN_number 33380
Detection_method Optical
ra 18.3780°
decl 44.4829°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33380 SUBJECT: GRB 230228A: Miryang Arirang Astronomical Observatory (MAAO) 0.7-m telescope optical upper limit DATE: 23/02/28 13:33:13 GMT FROM: Gu Lim at Seoul National U Gu Lim (PNU), Donghyun Kim (PNU), Dohyeong Kim (PNU), Myungshin Im (SNU ARC/SNU), Gregory S.H. Paek (SNU ARC/SNU), Keun-Hong Park (MAAO), and Seonghun Lim (MAAO) on behalf of GECKO collaboration We searched for the optical counterpart of a possible short burst GRB 230228A (Dichiara et al. GCN #33378) with the 0.7-m telescope at Miryang Arirang Astronomical Observatory (MAAO), located at Miryang, Republic of Korea. We observed the center of Swift-XRT localization (RA, Dec = 01:13:30.73, +44:28:58.4; Evans et al. GCN #33379) +4.09 hours after report, but could not find any possible transient within the field of view (28.2' x 28.2'). We performed flux calibration with the PS1 catalog and used the AB magnitude system. Each depth means 3 and 5 sigma upper limit for a point source detection. The magnitudes are not corrected for galactic extinction. object exposures date-obs (UT) MJD band Depth(3σ) Depth(5 σ) FWHM(") ========================================================================================= GRB230228A 60sx8 2023-02-28T09:56:11 60003.414 V <18.77 <18.21 2.8 Gravitational wave Electromagnetic wave Counterpart Korean Observatory (GECKO) is a network of 10+ 0.5m to 1m class telescopes over the world. ᐧ
GCN 33381 table
GRB_name GRB230228A
GCN_number 33381
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33381 SUBJECT: GRB 230228A: Nanshan/NEXT optical upper limit DATE: 23/02/28 16:50:31 GMT FROM: Dong Xu at NAOC/CAS T.H. Lu, S.Q. Jiang, S.Y. Fu, X. Liu (NAOC), Z.P. Zhu (NAOC, HUST), D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report: We observed the field of GRB 230228A detected by Swift (Dichiara et al., GCN 33378) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 12x200 s frames in the Sloan r-band and 12x200 s frames in the Sloan z-band, starting at 14:37:32 UT on 2023-02-28 (i.e., 8.77 hr after the BAT trigger). No optical source is detected in our stacked images at the enhanced XRT position (Evans, GCN 33379), and preliminary photometric results are as follows: T_mid-T0 (hr) Filter Upper limit(3-sigma) 9.86 r >20.6 9.14 z >19.5 calibrated with the nearby PanSTARRS field and not corrected for Galactic extinction.
GCN 33382 table
GRB_name GRB230228A
GCN_number 33382
Detection_method Swift-XRT Det
ra 18.3781°
decl 44.4829°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33382 SUBJECT: GRB 230228A: Enhanced Swift-XRT position DATE: 23/02/28 17:09:14 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 2720 s of XRT Photon Counting mode data and 3 UVOT images for GRB 230228A, 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 = 18.37812, +44.48293 which is equivalent to: RA (J2000): 01h 13m 30.75s Dec (J2000): +44d 28' 58.5" with an uncertainty of 2.1 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 33383 table
GRB_name GRB230228A
GCN_number 33383
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33383 SUBJECT: GRB 230228A: Mondy optical upper limit DATE: 23/02/28 19:12:56 GMT FROM: XXXX at IKI S. Belkin (IKI, HSE), E. Klunko (ISTP), A. Pozanenko (IKI), N. Pankov (HSE) report on behalf of GRB IKI FuN: We observed the field of GRB 230228A (Dichiara et al., GCN 33378) with AZT-33 telescope of Mondy observatory starting on Feb. 28 (UT) 12:46:56. We do not detect any optical counterpart within the enhanced Swift/XRT error box (Beardmore et al., GCN 33382). Preliminary photometry of the field is following Date UT start t-T0 Filter Exp. OT Err UL(3sigma) 2023-02-28 12:46:56 0.31053 R 30*120 n/d n/d 21.1 The photometry is based on the nearby USNO-B1.0 stars R2 RA DEC R2 01:13:35.3661600 +44:26:54.711600 15.50 01:13:18.4240800 +44:28:30.280800 16.70 The upper limit is not contradict observations reported earlier (Dichiara et al., GCN 33378; Lim et al., GCN 33380; Lu et al., GCN 33381).
GCN 33384 table
GRB_name GRB230228A
GCN_number 33384
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33384 SUBJECT: GRB 230228A: Swift-XRT refined Analysis DATE: 23/03/01 01:07:58 GMT FROM: Phil Evans at U of Leicester A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB) and S. Dichiara report on behalf of the Swift-XRT team: We have analysed 6.9 ks of XRT data for GRB 230228A (Dichiara et al. GCN Circ. 33378), from 102 s to 63.7 ks after the BAT trigger. The data comprise 10 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 33379). The light curve can be modelled with a power-law decay with a decay index of alpha=0.94 (+/-0.07). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.82 (+0.27, -0.25). The best-fitting absorption column is 2.1 (+1.1, -0.9) x 10^21 cm^-2, in excess of the Galactic value of 9.7 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.1 (+1.1, -0.9) x 10^21 cm^-2 Galactic foreground: 9.7 x 10^20 cm^-2 Excess significance: 1.9 sigma Photon index: 1.82 (+0.27, -0.25) If the light curve continues to decay with a power-law decay index of 0.94, the count rate at T+24 hours will be 2.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.1 x 10^-14 (1.0 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01156572. This circular is an official product of the Swift-XRT team.
GCN 33387 table
GRB_name GRB230228A
GCN_number 33387
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33387 SUBJECT: GRB 230228A: OSN optical upper limit DATE: 23/03/01 11:21:01 GMT FROM: Youdong HU at IAA-CSIC Y.-D. Hu, V. Casanova, E. Fernandez-Garcia, A. J. Castro-Tirado, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy (IAA-CSIC), on behalf of a larger collaboration, report: Following the detection of GRB 230228A by Swift (Dichiara et al. GCN 33378), we triggered the 0.9m OSN telescope in Granada (Spain) starting on Feb. 28 at 19:34:03 UT (~13.7 hrs post burst). Ten images covering the burst error region were taken in the I-band. No optical afterglow is detected in the stacked image down to I=20.2 mag. These results are in agreement with the non-detection reported by Lim et al. (GCNC 33380), Lu et al. (GCNC 33381) and Belkin et al. (GCNC 33383). We thank the staff at OSN for their excellent support.
GCN 33389 table
GRB_name GRB230228A
GCN_number 33389
Detection_method Fermi GBM Det
t_trigger 5:50:51 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 33389 SUBJECT: GRB 230228A: Fermi GBM Observation DATE: 23/03/01 16:12:06 GMT FROM: Cori Fletcher at USRA C. Fletcher (USRA), S. Lesage (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 05:50:51 UT on 28 February 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230228A (trigger 699256256/230228244). which was also detected by Swift BAT (S. Dichiara et al. 2023, GCN 33378). The Fermi GBM on-ground location is consistent with the Swift BAT position. The angle from the Fermi LAT boresight is 114 degrees. The GBM light curve consists of a single burst with a duration (T90) of about 2 s (10-1000 keV). The time-averaged spectrum from T0-0.9 to T0+1.5 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.8 +/- 0.3 and the cutoff energy, parameterized as Epeak, is 110 +/- 20 keV. The event fluence (10-1000 keV) in this time interval is (5.9 +/- 0.6)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0 s in the 10-1000 keV band is 6 +/- 1 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN 33392 table
GRB_name GRB230228A
GCN_number 33392
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33392 SUBJECT: GRB 230228A: Swift/UVOT Upper Limits DATE: 23/03/02 10:15:52 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (UCL-MSSL) and S. Dichiara (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 230228A 122 s after the BAT trigger (Dichiara et al., GCN Circ. 33378). No optical afterglow consistent with the enhanced XRT position (Beardmore et al., GCN Circ. 33382) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 122 272 147 >20.2 u_FC 335 585 246 >19.5 white 122 1706 240 >20.6 v 665 1752 97 >18.8 b 591 1851 88 >19.8 u 335 1830 341 >19.7 w1 714 1806 117 >20.0 m2 689 1780 97 >19.7 w2 640 1731 78 >20.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.085 in the direction of the burst (Schlegel et al. 1998).
GCN 33393 table
GRB_name GRB230228A
GCN_number 33393
Detection_method Swift-BAT Det
ra 18.3970°
decl 44.4950°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33393 SUBJECT: GRB 230228A: Swift-BAT refined analysis DATE: 23/03/02 13:58:16 GMT FROM: Tyler Parsotan at UMBC/GSFC/CRESST II H. A. Krimm (NSF), S. D. Barthelmy (GSFC), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU) (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 230228A (trigger #1156572) (Dichiara, et al., GCN Circ. 33378). The BAT ground-calculated position is RA, Dec = 18.397, 44.495 deg which is RA(J2000) = 01h 13m 35.3s Dec(J2000) = +44d 29' 41.9" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 78%. The mask-weighted light curve shows a Fast Rise Exponential Decay single pulse. T90 (15-350 keV) is 2.18 +- 0.40 sec (estimated error including systematics). The time-averaged spectrum from T-0.05 to T+2.53 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.66 +- 0.17. The fluence in the 15-150 keV band is 3.6 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+0.18 sec in the 15-150 keV band is 3.0 +- 0.4 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/1156572/BA/
GCN 33394 table
GRB_name GRB230228A
GCN_number 33394
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33394 SUBJECT: GRB 230228A: 6 GHz VLA radio upper limit DATE: 23/03/02 17:55:24 GMT FROM: Genevieve Schroeder at Northwestern University G. Schroeder (Northwestern), T. Laskar (Utah), E. Berger (Harvard) report: "We observed the position of the possibly short GRB 230228A (Dichiara et al. GCN 33378; Fletcher GCN 33389) with the Karl G. Jansky Very Large Array (VLA) under program 23A-296 (PI: Schroeder) beginning on 2023 March 2.02 UT (1.78 days post-burst) at a mean frequency of 6 GHz. Based on preliminary analysis, we do not detect any radio emission at or near the position of the XRT afterglow (Beardmore et al., GCN 33382) to a 3-sigma limit of 12 microJy. Additional followup is planned. We thank the VLA staff for quickly approving and executing these observations."
GCN 33426 table
GRB_name GRB230228A
GCN_number 33426
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33426 SUBJECT: GRB 230228A: VIRT Optical Upper Limit DATE: 23/03/08 21:15:43 GMT FROM: Priya Gokuldass at Florida Tech K. Noonan (UVI), N. Orange (OrangeWave Innovative Science, LLC), P. Gokuldass (Florida Tech), D. Morris (UVI), K. Smith (UVI), R. Querrard (UVI) report: We observed the field of GRB 230228A (Dichiara et al., GCN 33378) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 02-28-2023 starting at 23:29:41 UT (T+17.5 hrs). We performed a series of exposures in the R filter with a total exposure of 2940s. The weather conditions were clear during the hours of observation. The GRB was positioned at a lower altitude with an average airmass of 2.7. We detect no new source within the enhanced XRT position error circle (Beardmore et al., GNC 33382) consistent with other non-detections (Lim et al., GCN 33380, Lu et al., GCN 33381, Belkin et al., GCN 33383, Hu et al., GCN 33387, and Breeveld et al., GCN 33392) and report the following 3-sigma upper limit: T_mid ||Exposure ||Filter ||Limit T+ 18 hrs ||2940s ||R ||>20.6 The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase. We acknowledge financial support from NASA MUREP MIRO award 80NSSC21M0001, NASA EPSCoR award 80NSSC22M0063, and NSF EiR award 1901296. R.Q. and N.B.O. also acknowledge financial support from South Carolina Space Grant award 80NSSC20M0054. This message can be cited.
GCN 33436 table
GRB_name GRB230228A
GCN_number 33436
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 33436 SUBJECT: GRB 230228A: NUTTelA-TAO / BSTI Optical Limits DATE: 23/03/09 12:17:48 GMT FROM: Toktarkhan Komesh at Nazarbayev University T. Komesh (NU), Zh. Maksut (NU), B. Grossan (UCB, NU), Zh. Abdullayev (NU), M. Krugov (FAI), report on behalf of the Energetic Cosmos Laboratory: The Nazarbayev University Transient Telescope at Assy-Turgen Astrophysical Observatory (NUTTelA-TAO) observed the field of GRB 230228A, observing in Sloan g', r' and i' bands, with the Burst Simultaneous Three-Channel Imager (BSTI; Grossan, Kumar & Smoot 2019, JHEA, 32, 14). We obtained 10x300 s frames starting at UT 2023-02-28 14:03:02, 8.2 hours after the BAT trigger. Observations were made under clear conditions, beginning with the target at an altitude of 45 deg. No new or changing sources consistent with the XRT position (Evans 2023, GCN 33379) were detected. Note that these observations provide essentially full-time coverage, simultaneous in all three bands. We report the following results: start time t-t0(h) end time UL g' UL r' ULi' exposure_time (s) ------------ ----- ----------- ------ ------ ----- ------ 14:03:02 8.2 14:53:02 19.9 19.6 19.5 300 start time is in UT. t-t0(h) gives the time since trigger, in hours. UL gives the 5 sigma upper limit sensitivity in magnitudes for images with individual exposure times. The given upper limit values are derived from the average calibration with only 3 standard stars per frame, and no other analysis or corrections. ---------------------------------- NU = Nazarbayev University, Nur-Sultan, Kazakhstan UCB = University of California, Berkeley, USA FAI = Fesenkov Astrophysical Institute, Kazakhstan This research has been funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP14870504). The NUTTelA-TAO Team acknowledges the support of the staff of the Assy-Turgen Astrophysical Observatory, Almaty, Kazakhstan, and the Fesenkov Astrophysical Institute, Almaty, Kazkhstan.
GCN 33557 table
GRB_name GRB230228A
GCN_number 33557
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33557 SUBJECT: GRB 230228A: detection by GTC of the potential host galaxy DATE: 23/04/03 03:19:37 GMT FROM: Youdong HU at IAA-CSIC Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez (IAA-CSIC), Bin-bin Zhang (NJU) and D. Garcia (GTC, IAC) on behalf of a larger collaboration, report: Following the detection of short GRB 230228A by Swift (Dichiara et al. GCN 33378), we triggered the 10.4 m Gran Telescopio de Canarias (GTC) in La Palma (Spain) to image the GRB location with the OSIRIS instrument in two epochs (Mar 1 20:16 UT and Mar 3, 20:02 UT, 1.6 and 2.6 days post-burst respectively). Within the XRT error region, a constant brightness (z-band magnitude = 23.6) is found, which we suggest as the potential host galaxy of this burst. We thank the excellent support from the GTC staff.