//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32392 SUBJECT: GRB 220714B: Fermi GBM Final Real-time Localization DATE: 22/07/14 14:08:37 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 13:58:06 UT on 14 Jul 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220714B (trigger 679499891.272708 / 220714582). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 45.9, Dec = -22.6 (J2000 degrees, equivalent to J2000 03h 03m, -22d 36'), with a statistical uncertainty of 2.8 degrees. The angle from the Fermi LAT boresight is 124.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220714582/quicklook/glg_skymap_all_bn220714582.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220714582/quicklook/glg_healpix_all_bn220714582.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220714582/quicklook/glg_lc_medres34_bn220714582.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32393 SUBJECT: GRB 220714B: Swift detection of a burst DATE: 22/07/14 14:10:18 GMT FROM: Kim Page at U.of Leicester S. Laha (GSFC/UMBC), R. Brivio (INAF-OAB), P. D'Avanzo (INAF-OAB), S. Dichiara (PSU), M. Ferro (INAF-OAB), J.D. Gropp (PSU), N. J. Klingler (GSFC/UMBC/CRESSTII), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), K. L. Page (U Leicester), D. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB), M. H. Siegel (PSU) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 13:58:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 220714B (trigger=1116221). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 47.072, -19.334 which is RA(J2000) = 03h 08m 17s Dec(J2000) = -19d 20' 02" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 40 sec. The peak count rate was ~5500 counts/sec (15-350 keV), at ~13 sec after the trigger. The XRT began observing the field at 13:59:20.9 UT, 76.4 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 47.0803, -19.3269 which is equivalent to: RA(J2000) = 03h 08m 19.27s Dec(J2000) = -19d 19' 36.8" with an uncertainty of 5.2 arcseconds (radius, 90% containment). This location is 38 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. The initial flux in the 2.5 s image was 1.70e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 56 seconds with the White filter starting 121 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 none of the XRT position. Data from the list of sources generated on-board are not available at this time. No correction has been made for the expected extinction corresponding to E(B-V) of 0.032. Burst Advocate for this burst is S. Laha (sib.laha 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/) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32395 SUBJECT: GRB 220714B: Enhanced Swift-XRT position DATE: 22/07/14 18:41:13 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 1471 s of XRT Photon Counting mode data and 4 UVOT images for GRB 220714B, 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 = 47.08386, -19.32962 which is equivalent to: RA (J2000): 03h 08m 20.13s Dec (J2000): -19d 19' 46.6" 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32396 SUBJECT: GRB 220714B: UVOT afterglow discovery DATE: 22/07/14 18:53:03 GMT FROM: Frank Marshall at Swift/UVOT F.E. Marshall (NASA/GSFC) and S. Laha (GSFC/UMBC) report on behalf of the Swift team: UVOT took a finding chart exposure of 150 seconds with the White filter starting 3552 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 03:08:20.18 = 47.08409 DEC(J2000) = -19:19:45.3 = -19.32925 with a 90%-confidence error radius of about 0.61 arc sec. This position is 1.5 arc sec. from the center of the XRT error circle (Evans et al. GCN Circ. 32395). The estimated magnitude is 16.52 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.032. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32398 SUBJECT: GRB 220714B: Swift-XRT refined Analysis DATE: 22/07/15 04:20:19 GMT FROM: Phil Evans at U of Leicester M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and S. Laha report on behalf of the Swift-XRT team: We have analysed 6.0 ks of XRT data for GRB 220714B (Laha et al. GCN Circ. 32393), from 71 s to 45.6 ks after the BAT trigger. The data comprise 135 s in Windowed Timing (WT) mode (the first 4 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 Evans et al. (GCN Circ. 32395). The late-time light curve (from T0+3.5 ks) can be modelled with a power-law decay with a decay index of alpha=1.22 (+/-0.04). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 3.95 (+0.19, -0.18). The best-fitting absorption column is 2.7 (+/-0.3) x 10^21 cm^-2, in excess of the Galactic value of 3.2 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.03 (+/-0.10) and a best-fitting absorption column of 1.47 (+0.28, -0.27) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (4.4 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.47 (+0.28, -0.27) x 10^21 cm^-2 Galactic foreground: 3.2 x 10^20 cm^-2 Excess significance: 7.0 sigma Photon index: 2.03 (+/-0.10) If the light curve continues to decay with a power-law decay index of 1.22, the count rate at T+24 hours will be 0.059 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.0 x 10^-12 (2.6 x 10^-12) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01116221. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32400 SUBJECT: GRB 220714B: LCO Optical Observations DATE: 22/07/15 12:51:28 GMT FROM: Robert Strausbaugh at U. of the Virgin Islands R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (College of Marin) report on behalf of a larger collaboration: We observed the Swift GRB 220714B (Laha et al., GCN 32393) field with the LCO 1-meter Sinistro instrument at the South African Astronomical Observatory site, on July 15, from 02:32 to 02:59 UT (corresponding to 13.57 to 14.02 hours from the GRB trigger time) with the SDSS r and i filters. We performed a series of 3x300s exposures in i and r bands. We detect an optical counterpart at the same position as the UVOT afterglow (Marshall et al., GCN 32396) in both bands. The following magnitudes are calculated using the PanSTARRS catalog as reference: r = 19.77 +/- 0.07 i = 19.44 +/- 0.07 These magnitudes are not corrected for galactic extinction. R.S. is funded by NSF AST grant #1831682 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32402 SUBJECT: GRB 220714B: Fermi GBM observation DATE: 22/07/15 17:26:22 GMT FROM: Sarah Dalessi at UAH S. Dalessi (UAH), C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 13:58:06.27 UT on 14 July 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220714B (trigger 679499891 / 220714582) which was also detected by the Swift/BAT (S. Laha et al. 2022, GCN 32393) The Fermi GBM Final Real-time Localization (GCN 32392) is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 121 degrees. The GBM light curve consists of multiple peaks with a duration (T90) of about 28 s (50-300 keV). The time-averaged spectrum from T0-3.07 s to T0+26.6 s is well by a power law function with an exponential high-energy cutoff. The power law index is -1.63 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 139 +/- 24 keV The event fluence (10-1000 keV) in this time interval is (8.0 +/- 0.4)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+11.0 s in the 10-1000 keV band is 6.5 +/- 0.4 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/" //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32403 SUBJECT: GRB 220714B: Swift-BAT refined analysis DATE: 22/07/15 19:47:40 GMT FROM: Hans Krimm at NSF/NASA-GSFC S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), 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-173 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 220714B (trigger #1116221) (Laha, et al., GCN Circ. 32393). The BAT ground-calculated position is RA, Dec = 47.086, -19.321 deg which is RA(J2000) = 03h 08m 20.7s Dec(J2000) = -19d 19' 13.8" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 88%. The mask-weighted light curve shows a complex structure. The main period of emission starts around T-5 sec and continues to T+35 seconds with three main overlapping pulses. There is some precursor activity starting as early as T-45 seconds and low-level emission extending to T+60 seconds. The spacecraft slewed away from the burst location at around T+275 seconds. T90 (15-350 keV) is 50.10 +- 7.96 sec (estimated error including systematics). The time-averaged spectrum from -48.27 to +45.75 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.92 +- 0.07. The fluence in the 15-150 keV band is 4.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+12.89 sec in the 15-150 keV band is 3.8 +- 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/1116221/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32413 SUBJECT: GRB220714B: UVOT detections DATE: 22/07/18 18:49:00 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and S. Laha (NASA/UMCP) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 220714B 3628 s after the BAT trigger (Laha et al, GCN Circ. 32393) and detected a bright afterglow (Marshall & Laha, GCN Circ. 32396). Marshal and Laha provided the UVOT position of GRB 220714B. Perhaps due to a bright nearby star in the field, there were some exposures which were cut short, but in this report we include those using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373): Filter Time Exp(s) Mag white 150 55 18.0 +/- 0.1 white 3628 147 16.53+/- 0.03 v 3810 197 16.79+/- 0.09 m2 4115 197 16.42+/- 0.08 w1 4220 197 16.41+/- 0.06 u 4425 197 16.33+/- 0.04 b 4630 197 17.26+/- 0.05 white 4835 197 16.86+/- 0.03 w2 4992 102 17.16+/- 0.12 v 5897 18 17.4 +/- 0.6 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.032 in the direction of the burst (Schlegel et al. 1998).