//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32343 SUBJECT: GRB 220708A: Swift detection of a burst DATE: 22/07/08 04:54:20 GMT FROM: Valerio D'Elia at ASDC V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), T. Sakamoto (AGU) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 04:39:29 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 220708A (trigger=1115156). Swift did not slew immediately to the burst. The BAT on-board calculated location is RA, Dec 103.118, +72.191 which is RA(J2000) = 06h 52m 28s Dec(J2000) = +72d 11' 28" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed several peaks with a duration of about 40 sec. The peak count rate was ~1300 counts/sec (15-350 keV), at ~2 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+36.8 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is V. D'Elia (valerio.delia AT ssdc.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/) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32344 SUBJECT: GRB 220708A: Swift-XRT observations DATE: 22/07/08 06:02:25 GMT FROM: Phil Evans at U of Leicester M. Perri (SSDC & INAF-OAR), G. Tagliaferri (INAF-OAB), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), D.N. Burrows (PSU) and J.A. Kennea (PSU) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 220708A at 05:20:39.0 UT, 2469.3 seconds after the BAT trigger. No source was detected in 767 s of promptly downlinked data, which covered 94% of the BAT error circle. We are waiting for the full dataset to detect and localise the XRT counterpart. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32347 SUBJECT: GRB 220708A: Enhanced Swift-XRT position DATE: 22/07/08 13:27:53 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 1178 s of XRT Photon Counting mode data and 2 UVOT images for GRB 220708A, 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 = 103.12570, +72.14111 which is equivalent to: RA (J2000): 06h 52m 30.17s Dec (J2000): +72d 08' 28.0" with an uncertainty of 2.6 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32349 SUBJECT: GRB 220708A: BOOTES-5/JGT early optical upper limit DATE: 22/07/08 14:25:49 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), 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 220708A by Swift (D'Elia et al. GCNC 32343), the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) observed the GRB location starting on Jul 08, 04:40:14 UT (~ 45 s after trigger). In the early co-added image (30 x 10 s exposures in the clear filter), no optical afterglow is detected within the enhanced Swift/XRT error region (Osborne et al. GCNC 32347) down to 20.5 mag. We thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32352 SUBJECT: GRB 220708A: Swift-XRT refined Analysis DATE: 22/07/08 20:22:18 GMT FROM: Phil Evans at U of Leicester A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , B. Sbarufatti (PSU), D.N. Burrows (PSU), and V. D'Elia report on behalf of the Swift-XRT team: We have analysed 6.3 ks of XRT data for GRB 220708A (D'Elia et al. GCN Circ. 32343), from 2.5 ks to 49.4 ks after the BAT trigger. The data comprise 257 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 32347). The light curve can be modelled with a power-law decay with a decay index of alpha=1.1 (+nan, -nan). If the light curve continues to decay with a power-law decay index of 1.1, the count rate at T+24 hours will be 8.8 x 10^-4 count s^-1 The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01115156. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32354 SUBJECT: GRB 220708A: Swift/UVOT Upper Limits DATE: 22/07/09 03:01:38 GMT FROM: Alexander Belles at PSU/Swift A. Belles (PSU) and V. D'Elia (SSDC & INAF-OAR) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 220708A 2473 s after the BAT trigger (D'Elia et al., GCN Circ. 32343). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 32347) 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 2473 2622 147 >19.8 white 2473 8325 402 >20.2 v 2934 3134 197 >18.9 b 2680 3954 216 >20.1 u 2655 3749 216 >19.9 w1 2630 3544 216 >19.3 m2 3139 3339 197 >19.3 w2 2730 2930 197 >19.5 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.169 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32361 SUBJECT: GRB 220708A: Swift-BAT refined analysis DATE: 22/07/10 21:10:28 GMT FROM: Takanori Sakamoto at AGU S. D. Barthelmy (GSFC), D'Elia (SSDC & INAF-OAR), H. A. Krimm (NSF), 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+1566 sec from the recent telemetry downlink, we report further analysis of BAT GRB 220708A (trigger #1115156) (D'Elia, et al., GCN Circ. 32343). The BAT ground-calculated position is RA, Dec = 103.038, 72.199 deg which is RA(J2000) = 06h 52m 09.1s Dec(J2000) = +72d 11' 57.4" with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%. The BAT mask-weighted light curve shows a peak starting from T-1 s to T+3 s. T90 (15-350 keV) is 4.4 +- 1.0 sec (estimated error including systematics). The time-averaged spectrum from T-1.55 to T+3.44 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.31 +- 0.32. The fluence in the 15-150 keV band is 1.3 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+1.54 sec in the 15-150 keV band is 0.8 +- 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/1115156/BA/