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This page lists all entries on GRB180120A in GRBweb

Summary Fermi GBM GCN 22366 GCN 22367 GCN 22370

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB180120207
T0	4:58:13 UTC	Fermi_GBM
ra	151.7700°	Fermi_GBM
decl	27.7900°	Fermi_GBM
pos_error	2.99e+00°	Fermi_GBM
T90	28.928 s	Fermi_GBM
T90_error	0.724 s	Fermi_GBM
T90_start	4:58:14.344 UTC	Fermi_GBM
fluence	6.45e-05 erg/cm²	Fermi_GBM
fluence_error	4.98e-08 erg/cm²	Fermi_GBM
T100	30.272 s
GBM_located	True
mjd	58138.207094907404	Fermi_GBM

Fermi GBM table
GRB_name_Fermi	GRB180120207
trigger_name	bn180120207
ra	151.7700°
decl	27.7900°
pos_error	2.99e+00°
datum	2018-01-20
t_trigger	4:58:13 UTC
T90	28.928 s
T90_error	0.724 s
T90_start	4:58:14.344 UTC
fluence	6.45e-05 erg/cm²
fluence_error	4.98e-08 erg/cm²
flux_1024	3.67e+01 erg/cm²/s
flux_1024_error	4.98e-01 erg/cm²/s
flux_1024_time	1.77e+01 erg/cm²/s
flux_64	4.23e+01 erg/cm²/s
flux_64_error	2.15e+00 erg/cm²/s

GCN 22366 table
GRB_name	GRB180120A
GCN_number	22366
Detection_method	CALET
Circular_text	TITLE: GCN CIRCULAR NUMBER: 22366 SUBJECT: GRB 180120A CALET Gamma-Ray Burst Monitor detection DATE: 18/01/23 08:44:54 GMT FROM: Takanori Sakamoto at AGU Y. Shimizu (Kanagawa U), A. Yoshida, T. Sakamoto, V. Pal'shin, Y. Kawakubo, M. Moriyama, Y. Yamada, A. Tezuka, S. Matsukawa (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence), A. V. Penacchioni, P. S. Marrocchesi (U of Siena) and the CALET collaboration: The long-duration GRB 180120A (Fermi-GBM trigger #538117098; Konus-Wind trigger time on 04:58:18.23) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 04:58:09.54 on 20 January 2018. The burst signal was seen by the all CGBM instruments. The light curve shows two bright overlapping pulses. The first pulse starts at T-2 sec, peaks at T+6 sec and ends at T+20 sec. There is a possible additional pulse around T+15 sec. The second pulse starts at T+15 sec, peaks at T+25 sec and ends at T+40 sec. The T90 and the T50 durations measured by the SGM data are 24.9 +- 4.1 sec and 16.3 +- 0.4 sec (40-1000 keV), respectively. The ground processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1200459271/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.

GCN 22367 table
GRB_name	GRB180120A
GCN_number	22367
Detection_method	Fermi GBM Det
t_trigger	4:58:13 UTC
ra	151.7700°
decl	27.7900°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 22367 SUBJECT: GRB 180120A: Fermi GBM Detection DATE: 18/01/23 22:32:28 GMT FROM: Matthew Stanbro at UAH/Fermi M. Stanbro and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 04:58:13.00 UT on 20 January 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180120A (trigger 538117098 / 180120207) which was also detected by the CALET Gamma-ray Burst Monitor (Y. Shimizu et al. 2018, GCN 22366). The on-ground calculated location, using the GBM trigger data, is RA = 151.77, DEC = 27.79, with an uncertainty of 1 degree (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error. [Connaughton et al. 2015, ApJS, 216, 32]. The angle from the Fermi LAT boresight at the GBM trigger time is 85 degrees. The GBM light curve consists of several episodes with a duration (T90) of about 29 s (50-300 keV). The time-averaged spectrum from T0+0.90 s to T0+30.59 s is best fit by a Band function with Epeak = 130 +/- 2 keV, alpha = -1.05 +/- 0.01, and beta = -2.58 +/- 0.05. The event fluence (10-1000 keV) in this time interval is (6.27 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+17.66 s in the 10-1000 keV band is 36.70 +/- 0.50 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

GCN 22370 table
GRB_name	GRB180120A
GCN_number	22370
Detection_method	AstroSat CZTI
Circular_text	TITLE: GCN CIRCULAR NUMBER: 22370 SUBJECT: GRB 180120A: AstroSat CZTI detection DATE: 18/01/26 05:36:19 GMT FROM: Vidushi Sharma at IUCAA V. Sharma (IUCAA), V. Bhalerao (IIT-B), D. Bhattacharya (IUCAA), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the Astrosat CZTI collaboration: Analysis of Astrosat CZTI data showed the detection of a long GRB 180120A, which was also detected by Fermi-GBM (Stanbro M. et al., GCN 22367) and CALET (Shimizu Y. et al., GCN 22366). The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 04:58:15.5 UT, 2.5 s after the Fermi-GBM trigger. The measured peak count rate is 695.2 cts/s above the background in combined data of four quadrants, with a total of 7955 cts. The local mean background count rate was 557 cts/s. Using cumulative rates, we measure a T90 of 26.8 s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. 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, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.