GRB220623A

This page lists all entries on GRB220623A in GRBweb

Summary IPN Swift GCN 32243 GCN 32244 GCN 32245 GCN 32246 GCN 32247 GCN 32248 GCN 32251 GCN 32252 GCN 32253 GCN 32254 GCN 32255 GCN 32258 GCN 32264 GCN 32271 GCN 32273 GCN 34139

Summary table
Variable Value Source
T0 7:04:07.564 UTC GCN_circulars,Konus-Wind Det
ra 145.3972° Swift
decl 75.8216° Swift
pos_error 4.79e-04° Swift
GBM_located False
mjd 59753.29453199074 GCN_circulars,Konus-Wind Det
IPN table
GRB_name GRB220623A
ra 145.4625°
decl 75.8333°
pos_error 5.00e-02°
Swift table
GRB_name GRB220623A
t_trigger 7:04:14 UTC
ra 145.3972°
decl 75.8216°
pos_error 4.79e-04°
GCN 32243 table
GRB_name GRB220623A
GCN_number 32243
Detection_method Swift Det
t_trigger 7:04:14 UTC
ra 145.4620°
decl 75.8280°
Circular_text TITLE: GCN CIRCULAR NUMBER: 32243 SUBJECT: GRB 220623A: Swift detection of a burst DATE: 22/06/23 07:20:12 GMT FROM: Kim Page at U.of Leicester B. Sbarufatti (PSU), K. L. Page (U Leicester), T. M. Parsotan (GSFC/UMBC/CRESSTII), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team: At 07:04:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 220623A (trigger=1111672). Swift did not slew immediately to the burst. The BAT on-board calculated location is RA, Dec 145.462, +75.828 which is RA(J2000) = 09h 41m 51s Dec(J2000) = +75d 49' 42" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 25 sec. One peak occurred before the trigger and another occurred at the trigger time. The peak count rate was ~9000 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+61.4 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is B. Sbarufatti (bxs60 AT psu.edu). 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 32244 table
GRB_name GRB220623A
GCN_number 32244
Detection_method Swift-XRT Other
ra 145.3972°
decl 75.8216°
Circular_text TITLE: GCN CIRCULAR NUMBER: 32244 SUBJECT: GRB 220623A: Swift-XRT observations DATE: 22/06/23 08:35:46 GMT FROM: Phil Evans at U of Leicester J.A. Kennea (PSU), G. Cusumano (INAF-IASF PA), M. Perri (SSDC & INAF-OAR), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester) and D.N. Burrows (PSU) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 220623A at 08:11:23.5 UT, 4029.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 145.39717, 75.82155 which is equivalent to: RA(J2000) = 09h 41m 35.32s Dec(J2000) = +75d 49' 17.6" with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 61 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 in excess of the Galactic value (2.49 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.4 (+2.74/-2.39) x 10^21 cm^-2 (90% confidence).
GCN 32245 table
GRB_name GRB220623A
GCN_number 32245
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32245 SUBJECT: GRB 220623A: iTelescope optical upper limit DATE: 22/06/23 10:17:01 GMT FROM: Filipp Dmitrievich Romanov at Amateur astronomer I observed the field of GRB 220623A (Sbarufatti et al., GCN Circ. 32243) remotely using telescope T24 (0.61-m f/6.5 reflector + CCD) of iTelescope.Net in Sierra Remote Observatory (Auberry, California, USA) on 2022-06-23. Three images (exposures 300 seconds, BINx1) were obtained with Ic filter with mid time 09:26:42 UTC (8548 seconds after the trigger). I did not detect any optical afterglow in the BAT and the XRT (Kennea et al., GCN Circ. 32244) positions. The magnitude limit is about 18 mag, compared to the magnitudes of nearby stars from the USNO-B1.0 Catalog (Monet et al., 2003). F. D. Romanov.
GCN 32246 table
GRB_name GRB220623A
GCN_number 32246
Detection_method AstroSat CZTI
Circular_text TITLE: GCN CIRCULAR NUMBER: 32246 SUBJECT: GRB 220623A: AstroSat CZTI detection DATE: 22/06/23 11:15:23 GMT FROM: Gaurav Waratkar at IIT,Bombay R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 220623A which was also detected by Swift-BAT (Sbarufatti et al., GCN 32243), Swift-XRT (Kennea et al., GCN 32244) and INTEGRAL SPI-ACS (TrigNum: 9966). The source was clearly detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2022-06-23 07:04:14.500 UTC. The measured peak count rate associated with the burst is 127 (+38, -17) counts/s above the background in the combined data of three (out of four) quadrants, with a total of 738 (+204, -207) counts. The local mean background count rate was 360 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of 9 (+9, -2) s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2022-06-23 07:04:13.771 UTC. The measured peak count rate is 570 (+74, -60) counts/s above the background in the combined Veto data of all quadrants, with a total of 2919 (+440, -459) counts. The local mean background count rate was 1502 (+5, -5) counts/s. We measure a T90 of 8 (+4, -1) s from the cumulative Veto light curve. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
GCN 32247 table
GRB_name GRB220623A
GCN_number 32247
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 32247 SUBJECT: GRB 220623A: AGILE detection DATE: 22/06/23 11:41:48 GMT FROM: Alessandro Ursi at INAF/IAPS A. Ursi (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, L. Foffano, E. Menegoni, G. Piano (INAF/IAPS), A. Bulgarelli, A. Di Piano, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), F. Longo (Univ. Trieste and INFN Trieste), and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team: The AGILE satellite detected the GRB 220623A at T0 = 2022-06-23 07:04:14 s (UTC), reported by Swift BAT (GCN #32243), Swift XRT (GCN #32244), and AstroSat CZTI (GCN #32246). The burst is clearly visible in the AGILE scientific ratemeters of the SuperAGILE (SA; 20-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 25 s and it released a total number of 1950 counts in the SA detector (above a background rate of 85 Hz), 29800 counts in the MCAL detector (above a background rate of 1050 Hz), and 72370 counts in the AC detector (above a background rate of 2770 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB220623A_AGILE_RM.png . The event also triggered a partial high time resolution MCAL data acquisition, from T1 = 2022-06-23 07:04:09.65 s (UTC) to T2 = 2022-06-23 07:04:16.15 s (UTC), and released 4200 counts in the detector, above a background rate of 530 Hz. The MCAL light curve can be found at http://www.agilescienceapp.it/notices/GRB220623A_078852_583052654.000000.png . At the T0, the event was 35 deg off-axis. Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html.
GCN 32248 table
GRB_name GRB220623A
GCN_number 32248
Detection_method Swift-XRT Det
ra 145.3938°
decl 75.8210°
Circular_text TITLE: GCN CIRCULAR NUMBER: 32248 SUBJECT: GRB 220623A: Enhanced Swift-XRT position DATE: 22/06/23 15:39:19 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 1568 s of XRT Photon Counting mode data and 5 UVOT images for GRB 220623A, 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 = 145.39376, +75.82100 which is equivalent to: RA (J2000): 09h 41m 34.50s Dec (J2000): +75d 49' 15.6" 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 32251 table
GRB_name GRB220623A
GCN_number 32251
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32251 SUBJECT: GRB 220623A: BOOTES-5/JGT optical afterglow detection DATE: 22/06/23 17:57:34 GMT FROM: Youdong HU at IAA-CSIC Y.-D. Hu, E. Fernandez-Garcia, I. Perez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, R. Sanchez-Ramirez (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar and I. Carrasco (UMA), I. H. Park (SKKU) on behalf of a larger collaboration, report: Following the detection of GRB 220623A by both Swift (Sbarufatti et al. GCNC 32243), AstroSat (Gopalakrishnan et al. GCNC 32246) and AGILE (Ursi et al. GCNC 32247), the 60cm BOOTES-5/JGT robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) automatically responded to the burst on June 23 at 07:05:03 UT (i.e. ~ 47 s after trigger). In the first 1 s exposure image, an optical afterglow is detected at the enhanced Swift-XRT position (Beardmore et al. GCNC 32248) with a preliminary magnitude of 17.1 +- 0.2 mag (clear filter). Further observations are ongoing and encouraged. We thank the staff at San Pedro Martir Observatory for their excellent support.
GCN 32252 table
GRB_name GRB220623A
GCN_number 32252
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 32252 SUBJECT: GRB 220623A: Swift/UVOT Upper Limits DATE: 22/06/23 18:32:09 GMT FROM: Alexander Belles at PSU/Swift A. Belles (PSU) and B. Sbarufatti (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 220623A 4034 s after the BAT trigger (Sbarufatti et al., GCN Circ. 32243). No optical afterglow consistent with the XRT position (Kennea et al. GCN Circ. 32244) 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 4034 4184 147 >19.9 white 4034 5415 344 >20.1 v 4190 9642 326 >18.9 b 5010 5210 197 >19.4 u 4805 5005 197 >19.0 w1 4600 4800 197 >19.3 m2 4395 4595 197 >19.9 w2 5421 5621 197 >19.6 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.036 in the direction of the burst (Schlegel et al. 1998).
GCN 32253 table
GRB_name GRB220623A
GCN_number 32253
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32253 SUBJECT: GRB 220623A: NOT optical observations DATE: 22/06/23 23:43:30 GMT FROM: Daniele B Malesani at Radboud U D. B. Malesani (Radboud Univ. and DAWN/NBI), L. Izzo (DARK/NBI), J. S. Thomsen (NOT), R. Clavero (IAC) report on behalf of a larger collaboration: We observed the field of GRB 220623A (Sbarufatti et al., GCN 32243) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC imager. Two sets of observations were acquired in the r and z filters, with mid times 2022 Jun 23.890 and 23.903 UT (14.3 and 14.6 hr after the trigger, respectively). The exposure times were 3x300 and 5x200 s in r and z, respectively. No source is detected in our images within or close to the GRB XRT position (Evans et al., GCN 32248), down to the following 3-sigma limits: r > 23.4 (AB); z > 22.5 (AB). Flux calibration was carried out against nearby stars from the Pan-STARRS catalog.
GCN 32254 table
GRB_name GRB220623A
GCN_number 32254
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 32254 SUBJECT: GRB 220623A: Swift-XRT refined Analysis DATE: 22/06/24 01:14:07 GMT FROM: Phil Evans at U of Leicester V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB) and B. Sbarufatti report on behalf of the Swift-XRT team: We have analysed 7.4 ks of XRT data for GRB 220623A (Sbarufatti et al. GCN Circ. 32243), from 4.0 ks to 57.1 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 32248). The light curve can be modelled with a power-law decay with a decay index of alpha=1.85 (+0.14, -0.13). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.92 (+0.19, -0.18). The best-fitting absorption column is 2.0 (+0.7, -0.6) x 10^21 cm^-2, in excess of the Galactic value of 2.5 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 3.7 x 10^-11 (4.8 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.0 (+0.7, -0.6) x 10^21 cm^-2 Galactic foreground: 2.5 x 10^20 cm^-2 Excess significance: 4.7 sigma Photon index: 1.92 (+0.19, -0.18) If the light curve continues to decay with a power-law decay index of 1.85, the count rate at T+24 hours will be 1.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.0 x 10^-14 (9.3 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/01111672. This circular is an official product of the Swift-XRT team.
GCN 32255 table
GRB_name GRB220623A
GCN_number 32255
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32255 SUBJECT: GRB 220623A: AbAO optical upper limit DATE: 22/06/24 01:50:04 GMT FROM: Alexei Pozanenko at IKI, Moscow N. Pankov (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), S. Belkin (IKI), V. R. Ayvazian (AbAO), D. Datashvili (AbAO), G. V. Kapanadze (AbAO) report on behalf of GRB IKI FuN We observed the field of GRB 220623A detected by Swift (Sbarufatti et al., GCN 32243; Kennea et al., GCN 32244), AstroSat (Gopalakrishnan et al., GCN 32246) and AGILE (Ursi et al., GCN 32247) with AS-32 telescope of Abastumani Observatory (AbAO). We do not detect any optical sources within enhanced XRT position (Beardmore et al., GCN 32248). In particular we do not detect the source reported by Y.-D. Hu et al. (GCN 32251). Preliminary upper limit of a stacked image is following: Date, UT start, t-T0, Exp., Filter, OT, Err, UL(3 sigma) (mid, days) 2022-06-23 17:53:02 0.47313 65*60 R n/d n/d 21.5 The photometry is based on nearby USNO-B1.0 stars, R2 magnitude USNO-B1.0_id R2 1658-0059467 15.40 1658-0059509 15.39
GCN 32258 table
GRB_name GRB220623A
GCN_number 32258
Detection_method Konus-Wind Det
t_trigger 7:04:07.564 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 32258 SUBJECT: Konus-Wind detection of GRB 220623A DATE: 22/06/24 12:32:17 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 220623A (Swift detection: Sbarufatti et al., GCN Circ. 32243; AstroSat-CZTI detection: Gopalakrishnan et al., GCN Circ 32246; AGILE detection: Ursi et al., GCN Circ 32247) triggered Konus-Wind (KW) at T0=25447.564 s UT (07:04:07.564). The burst light curve shows a bright, double-peaked structure which starts at ~T0-0.2 s and has a total duration of ~15 s. A weaker emission in visible in the KW lc until ~T0+50 s. The emission at the bright phase of the event is seen up to ~2.5 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB220623_T25447/ As observed by Konus-Wind, the burst had a fluence of (2.5 ± 0.3)x10^-5 erg/cm^2 and a 64-ms peak energy flux, measured from T0 + 0.064 s, of (8.8 ± 0.8)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0 to T0+49.408 s) is best fit in the 20 keV - 15 MeV range by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.13(-0.11,+0.12) and Ep = 869(-224,+363) keV (chi2 = 93/98 dof). Fitting this spectrum by a Band function yields the same values of alpha and Ep, and an upper limit on the high energy photon index beta of -2.6 (chi2 = 93/97 dof). The spectrum near the peak count rate (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 15 MeV range by a CPL function with alpha = -0.82(-0.09,+0.10) and Ep = 910(-136,+177) keV (chi2 = 86/98 dof). Fitting this spectrum by a Band function yields the same values of alpha and Ep, and an upper limit on the high energy photon index beta of -2.9 (chi2 = 86/97 dof). All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.
GCN 32264 table
GRB_name GRB220623A
GCN_number 32264
Detection_method Swift-BAT Det
ra 145.4590°
decl 75.8230°
Circular_text TITLE: GCN CIRCULAR NUMBER: 32264 SUBJECT: GRB 220623A: Swift-BAT refined analysis DATE: 22/06/24 18:49:10 GMT FROM: Tyler Parsotan at UMBC/GSFC/CRESST II  T. Parsotan (GSFC/UMBC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), (i.e. the Swift-BAT team): Using the data set from T-240 to T+842 sec from the recent telemetry downlink, we report further analysis of BAT GRB 220623A (trigger #1111672) (Sbarufatti, et al., GCN Circ. 32243). The BAT ground-calculated position is RA, Dec = 145.459, 75.823 deg which is RA(J2000) = 09h 41m 50.1s Dec(J2000) = +75d 49' 22.9" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 94%. The BAT light curve showed a triple-peaked structure. One possible precursor peak occurred prior to the trigger, another occurred at the trigger time, and the final occurred 10 s post trigger. At ~40 s there may be broad emission as well. T90 (15-350 keV) is 57.11 +- 8.53 sec (estimated error including systematics). The time-averaged spectrum from -3.84 to 73.652 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.33 +- 0.07. The fluence in the 15-150 keV band is 3.5 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-0.15 sec in the 15-150 keV band is 4.5 +- 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/1111672/BA/
GCN 32271 table
GRB_name GRB220623A
GCN_number 32271
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32271 SUBJECT: GRB 220623A: T193-OHP optical upper limit DATE: 22/06/26 16:43:42 GMT FROM: Benjamin Schneider at CEA B. Schneider, D. Turpin, E. Le Floc’h (CEA), C. Adami, S. Basa (LAM), S. Vergani, J. Palmerio (GEPI) report on behalf of a larger collaboration: We observed the field of GRB 220623A (Sbarufatti et al. GCN 32243; Gopalakrishnan et al. GCN 32246; Ursi et al. GCN 32247) using the T193cm telescope at Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. Six exposures (1x300s + 5x600s) were obtained in the i band using the red MISTRAL set-up from 2022 23 Jun 21:32:10 UT to 2022 23 Jun 23:05:49 UT (mid time ~15.2h after trigger). Data reduction is still preliminary. In the combined frame, we do not detect any source within the 2.2 arsec error circle of the enhanced XRT position (Evans et al. GCN 32248; Beardmore et al. GCN 32248) down to the following 3-sigma limit: i > 21.5 mag (AB) The photometric calibration was performed using nearby stars from the PanSTARRS catalog. We acknowledge the support from Observatoire de Haute-Provence, in particular Jean-Pierre Troncin and Jerome Schmidt.
GCN 32273 table
GRB_name GRB220623A
GCN_number 32273
Detection_method Optical
ra 145.3938°
Circular_text TITLE: GCN CIRCULAR NUMBER: 32273 SUBJECT: GRB 220623A: GIT optical upper limits. DATE: 22/06/27 08:51:40 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay V. Swain (IITB), H. Kumar (IITB), K. Angail (IAO), V. Bhalerao (IITB), G. C. Anupama (IIA), S. Barway (IIA) report on behalf of the GIT team: We observed GRB 220623A detected by Swift (Sbarufatti et al., GCN 32243; Kennea et al., GCN 32244), AstroSat (Gopalakrishnan et al., GCN 32246) and AGILE (Ursi et al., GCN 32247), with the 0.7m GROWTH-India Telescope (GIT). The observations started at 15:05:15 UT on 2022-06-23, 8.02 hours after the Swift trigger. We obtained multiple 300-sec exposures in the g', r' and i' filters. We did not detect any new source in our stacked images within the 2.1 arcsec radius circle around R.A.= 09h 41m 34.50s, Dec.= +75d 49' 15.6” (Phil Evans et al. GCN #32248). The obtained upper limits follow as: ----------------------------------------------------------------------- JD(mid) | T_mid-T0(hrs) | Exposure(sec) | Filter | Lim_mag(5-sigma) | ----------------------------------------------------------------------- 2459754.132298985 | 8.10 | 3 x 300 (stacked) | r' | > 21.10 | 2459754.141603815 | 8.32 | 2 x 300 (stacked) | g' | > 21.01 | 2459754.149142145 | 8.50 | 2 x 300 (stacked) | i' | > 20.23 | ----------------------------------------------------------------------- These upper limits are consistent with Benjamin et al.(GCN #32271), Alexei et al.(GCN #32255), Daniele et al.(GCN #32253), Alexander et al.(GCN #32252), Filipp et al.(GCN #32245). The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction. The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.
GCN 34139 table
GRB_name GRB220623A
GCN_number 34139
Detection_method Konus-Wind Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 34139 SUBJECT: Konus-Wind detection of GRB 220623A DATE: 23/07/03 19:54:02 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, Y. Temiraev, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 220623A (MAXI-GSC detection: Hagiwara et al., GCN 34068) was detected by Konus-Wind (KW) in the waiting mode. A Bayesian block analysis of the KW waiting mode data in the 20-1500 keV band reveals a multi-peaked structure which starts at ~T0 and ends at ~T0+580 s, where T0 = T0(MAXI) = 07:23:37 UT. The KW light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB230623A/ Modelling a time-integrated spectrum of the burst by a power law (PL) model dN/dE ~ E^alpha yields alpha = -2.18(-0.04,+0.05). The spectrum near the peak count rate, measured from T0+43.303 s to T0+75.687 s, can be described by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.58(-0.13, +0.15) and Ep = 243(-57,+141) keV. The total burst fluence is 5.77(-0.34,+0.52)x10^-5 erg/cm^2, and the 2.944 s peak energy flux is 6.08(-0.97,+1.40)x10^-7 erg/cm^2. (both in the 20 keV - 10 MeV energy range). All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.