GRB160422A

This page lists all entries on GRB160422A in GRBweb

Summary Fermi GBM IPN Fermi LAT GCN 19329 GCN 19330 GCN 19331 GCN 19333 GCN 19334 GCN 19345 GCN 19346 GCN 19352 GCN 19359

Summary table
Variable Value Source
GRB_name_Fermi GRB160422499
T0 11:58:59.810 UTC Fermi_LAT
ra 42.0949° Fermi_LAT
decl -57.8751° Fermi_LAT
pos_error 1.25e-04° Fermi_LAT
T90 12.288 s Fermi_GBM
T90_error 0.362 s Fermi_GBM
T90_start 11:59:01.639 UTC Fermi_GBM
fluence 8.80e-05 erg/cm² Fermi_GBM
fluence_error 7.05e-08 erg/cm² Fermi_GBM
T100 14.117 s
GBM_located False
mjd 57500.49930335648 Fermi_LAT
Fermi GBM table
GRB_name_Fermi GRB160422499
trigger_name bn160422499
ra 41.2600°
decl -58.2200°
pos_error 2.47e+00°
datum 2016-04-22
t_trigger 11:59:00.807 UTC
T90 12.288 s
T90_error 0.362 s
T90_start 11:59:01.639 UTC
fluence 8.80e-05 erg/cm²
fluence_error 7.05e-08 erg/cm²
flux_1024 9.38e+01 erg/cm²/s
flux_1024_error 5.70e-01 erg/cm²/s
flux_1024_time 8.06e+00 erg/cm²/s
flux_64 1.07e+02 erg/cm²/s
flux_64_error 2.35e+00 erg/cm²/s
IPN table
GRB_name GRB160422A
ra 42.0500°
decl -57.9000°
pos_error 5.00e-02°
Fermi LAT table
GRB_name_Fermi GRB160422499
GRB_name GRB160422A
MET 483019143.81
datum 2016-04-22
t_trigger 11:58:59.810 UTC
ra 42.0949°
decl -57.8751°
pos_error 1.25e-04°
GCN 19329 table
GRB_name GRB160422A
GCN_number 19329
Detection_method Fermi LAT Det
t_trigger 11:59:00.810 UTC
ra 42.0500°
decl -57.9000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19329 SUBJECT: GRB 160422A: Fermi-LAT Detection DATE: 16/04/22 19:26:41 GMT FROM: Judith Racusin at GSFC M. Yassine (LUPM, Montpellier), J. L. Racusin (NASA/GSFC), and N. Omodei (Stanford) report on behalf of the Fermi-LAT team: Fermi LAT detected high-energy emission associated with GRB 160422A, which was also detected by Fermi GBM (trigger 483019143 / 160422499) at 11:59:00.81 on April 22, 2016. The best LAT on-ground location is found to be: RA, Dec (J2000) = 42.05, -57.9 with an error radius of 0.07 deg (90% containment, statistical error only). This was 80 deg from the LAT boresight at the time of the trigger, and triggered an autonomous repoint of the spacecraft. The GRB became unocculted by the Earth and entered the LAT field of view at ~T0+400 seconds. The data from the Fermi-LAT show a significant increase in the event rate that is spatially correlated with the trigger with high significance. The highest-energy photon is a 12 GeV event which is observed 770 seconds after the GBM trigger. A Swift ToO has been requested for this burst. The Fermi-LAT point of contact for this burst is Manal Yassine (manal.yassine@lupm.in2p3.fr). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN 19330 table
GRB_name GRB160422A
GCN_number 19330
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19330 SUBJECT: GRB 160422A: Swift ToO observations DATE: 16/04/22 20:11:16 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Fermi/LAT GRB 160422A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020605 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/LAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team.
GCN 19331 table
GRB_name GRB160422A
GCN_number 19331
Detection_method Fermi GBM Det
t_trigger 11:59:00.810 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 19331 SUBJECT: GRB 160422A: Fermi GBM observation DATE: 16/04/22 21:44:08 GMT FROM: Eric Burns at U of Alabama E. Burns (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 11:59:00.81 UT on 22 April 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 160422A (trigger 483019144 / 160422499). The trigger resulted in an Autonomous Repoint Request (ARR) by the GBM Flight Software owing to the high peak flux of the GRB. This ARR was accepted and the spacecraft slewed to the GBM in-flight location. The initial angle from the Fermi LAT boresight to the LAT location is 53 degrees. The GBM on-ground location is consistent with the LAT location (Yassine et al., GCN 19329). The GBM light curve consists of a single main peak with a duration (T90) of about 12 s (50-300 keV). The time-averaged spectrum from T0 s to T0+13.1 s is well fit by a Band function with Epeak = 242 +/- 4 keV, alpha = -0.95 +/- 0.01, and beta = -2.42 +/- 0.04. The event fluence (10-1000 keV) in this time interval is (8.68 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+8.0 s in the 10-1000 keV band is 93.8 +/- 0.6 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 19333 table
GRB_name GRB160422A
GCN_number 19333
Detection_method Swift-UVOT Other
ra 42.0950°
decl -57.8751°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19333 SUBJECT: GRB 160422A: Swift/UVOT Candidate Afterglow DATE: 16/04/23 00:48:34 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 160422A 32624 s after the LAT trigger (Yassine et al. GCN Circ. 19329). A candidate optical afterglow is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 02:48:22.79 = 42.09497 (deg.) Dec (J2000) = -57:52:30.4 = -57.87511 (deg.) with an estimated uncertainty of 0.45 arc sec. (radius, 90% confidence). Preliminary detections 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 33427 34064 627 19.71 +/- 0.07 u 32624 33420 783 19.05 +/- 0.11 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998). [GCN OPS NOTE(25apr16), Per author's request, the LAT reference was corrected.]
GCN 19334 table
GRB_name GRB160422A
GCN_number 19334
Detection_method Swift-XRT Other
ra 42.0947°
decl -57.8757°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19334 SUBJECT: GRB 160422A: Swift-XRT afterglow detection DATE: 16/04/23 05:15:14 GMT FROM: Alessandro Maselli at INAF/IASF Palermo A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), C. Pagani (U. Leicester), P. D'Avanzo (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 160422A (Yassine et al. GCN Circ. 19329), collecting 4.9 ks of Photon Counting (PC) mode data between T0+32.6 ks and T0+45.8 ks. Three uncatalogued X-ray sources are detected inside or close to the Fermi/LAT error region, of which one ("Source 1") is above the RASS limit, and is therefore likely the GRB afterglow. The position of this source is RA, Dec=42.0947, -57.8757 which is equivalent to: RA (J2000): 02:48:22.74 Dec(J2000): -57:52:32.6 with an uncertainty of 3.6 arcsec (radius, 90% confidence). This position is 2.0 arcmin from the Fermi/LAT position and 2.6 arcsec from the Swift-UVOT candidate optical afterglow (Marshall, GCN Circ. 19333). The light curve can be modelled with a power-law decay with a decay index of alpha=1.3 (+/-1.0). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.3 (+0.4, -0.3). The best-fitting absorption column is 2.4 (+1.3, -1.0) x 10^21 cm^-2, in excess of the Galactic value of 2.3 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 3.1 x 10^-11 (5.1 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.4 (+1.3, -1.0) x 10^21 cm^-2 Galactic foreground: 2.3 x 10^20 cm^-2 Excess significance: 3.5 sigma Photon index: 2.3 (+0.4, -0.3) If the light curve continues to decay with a power-law decay index of 1.3, the count rate at T+24 hours will be 0.017 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.2 x 10^-13 (8.5 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis of the likely afterglow are at http://www.swift.ac.uk/ToO_GRBs/00020605/index_1.php. The results of the full analysis of the XRT observations are available at http://www.swift.ac.uk/ToO_GRBs/00020605. This circular is an official product of the Swift-XRT team.
GCN 19345 table
GRB_name GRB160422A
GCN_number 19345
Detection_method CALET
Circular_text TITLE: GCN CIRCULAR NUMBER: 19345 SUBJECT: GRB 160422A: CALET Gamma-Ray Burst Monitor detection DATE: 16/04/26 01:27:37 GMT FROM: Takanori Sakamoto at AGU S. Ricciarini (U of Florence), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), P. S. Marrocchesi (U of Siena) and the CALET collaboration: The long-duration GRB 160422A (Burns et al., GCN circ. 19331; Yassine et al., GCN circ. 19329; INTEGRAL-ACS #7450) triggered the CALET Gamma-Ray Burst Monitor (CGBM) at 11:59:08.28 on 22 April 2016. The burst signal was only seen by the SGM instrument. This fact is consistent that the GRB location of the Fermi-LAT (Yassine et al., GCN circ. 19329) was outside the field of view of the CALET CALorimeter (CAL) instrument, which has the capability to observe gamma-rays above 1 GeV, at the trigger time. The boresight angle of the SGM to the Fermi-LAT position was ~105 deg. The light curve of the SGM shows at least two episodes. The first episode starts at T0-7 sec, peaks at T0-6 sec and ends at T0-4 sec. The second episode shows the emission starting at T0, peaking at T0+1 sec and ending at T0+4 sec. The T90 duration measured by the SGM data is 8.7 +- 0.3 sec (100-1000 keV). The CGBM data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN 19346 table
GRB_name GRB160422A
GCN_number 19346
Detection_method Swift-UVOT Other
ra 42.0949°
decl -57.8751°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19346 SUBJECT: GRB 160422A: Swift/UVOT Afterglow Confirmation DATE: 16/04/26 02:00:23 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 160422A 32624 s after the LAT trigger (Yassine et al., GCN Circ. 19329). The optical afterglow candidate (Marshall, GCN Circ. 19333) has faded in a later observation in the same filter. Its positional consistency with the XRT source (Maselli et al. GCN Circ. 19334) and its fadiing behavior confirm that it is the optical afterglow of GRB 160422A. The preliminary UVOT position is: RA (J2000) = 02:48:22.78 = 42.09493 (deg.) Dec (J2000) = -57:52:30.4 = -57.87512 (deg.) with an estimated uncertainty of 0.45 arc sec. (radius, 90% confidence). Preliminary detections 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 33427 34064 627 19.50 0.05 white 44903 44701 785 19.91 0.06 v 39970 45820 320 19.29 0.23 u 32624 33420 783 19.09 0.10 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN 19352 table
GRB_name GRB160422A
GCN_number 19352
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 19352 SUBJECT: GRB 160422A: GROND NIR afterglow detection DATE: 16/04/26 11:17:40 GMT FROM: Jan Bolmer at MPE/Garching T. Schweyer, J. Bolmer, J. Greiner (all MPE Garching), and D. A. Kann (TLS Tautenburg) report on behalf of the GROND team: We observed the field of GRB 160422A (Fermi/GBM trigger 483019143; Yassine et al., GCN #19329) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 23:02 UT on 22-04-2016, 11.06 hrs after the GRB trigger. They were performed at an average seeing of 2.0" and at an average airmass of 2.2, but also through thick cirrus, which prevented proper measurements in g'r'i'z'. We found a single point source coincident with the 0.45" Swift-UVOT error circle reported by Marshall et al. (GCN #19333). Based on the first 4 min of total exposures in JHK, we estimate preliminary magnitudes (all in AB system) of J = 17.9 +/- 0.3 mag, H = 17.4 +/- 0.3 mag, and K > 17.0 mag. Given magnitudes are calibrated against 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.02 mag in the direction of the burst (Schlafly & Finkbeiner 2011).
GCN 19359 table
GRB_name GRB160422A
GCN_number 19359
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19359 SUBJECT: GRB 160422A: XRT Afterglow Confirmation DATE: 16/04/28 13:38:27 GMT FROM: Alessandro Maselli at INAF/IASF Palermo A. Maselli (INAF-IASFPA), D. Malesani (DARK/NBI), K.L. Page and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has conducted further observations of the field of the Fermi-detected burst GRB 160422A (Yassine et al., GCN Circ. 19329; Burns et al., GCN Circ. 19331), extending from T0+400 ks to T0+470 ks after the Fermi/GBM trigger. At the position of the candidate afterglow reported by Maselli et al. (GCN Circ. 19334) no source is detected in the new observation, with a three sigma upper limit of 2.6e-3 ct/s. This confirms that it was the X-ray afterglow of GRB 160422A. The results of the full analysis of the XRT observations are available at http://www.swift.ac.uk/xrt_products/00020605 This circular is an official product of the Swift-XRT team.