| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB191225309 |
|
| T0 |
7:25:10.865 UTC |
Fermi_GBM |
| ra |
95.4900° |
Fermi_GBM |
| decl |
-17.3500° |
Fermi_GBM |
| pos_error |
5.35e+00° |
Fermi_GBM |
| T90 |
112.384 s |
Fermi_GBM |
| T90_error |
11.31 s |
Fermi_GBM |
| T90_start |
7:25:10.865 UTC |
Fermi_GBM |
| fluence |
2.93e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
3.02e-08 erg/cm² |
Fermi_GBM |
| T100 |
112.384 s |
|
| GBM_located |
True |
|
| mjd |
58842.30915353009 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB191225309 |
| trigger_name |
bn191225309 |
| ra |
95.4900° |
| decl |
-17.3500° |
| pos_error |
5.35e+00° |
| datum |
2019-12-25 |
| t_trigger |
7:25:16.497 UTC |
| T90 |
112.384 s |
| T90_error |
11.31 s |
| T90_start |
7:25:10.865 UTC |
| fluence |
2.93e-06 erg/cm² |
| fluence_error |
3.02e-08 erg/cm² |
| flux_1024 |
3.59e+00 erg/cm²/s |
| flux_1024_error |
2.10e-01 erg/cm²/s |
| flux_1024_time |
-2.56e-01 erg/cm²/s |
| flux_64 |
5.87e+00 erg/cm²/s |
| flux_64_error |
1.05e+00 erg/cm²/s |
| GCN 26579 table |
|---|
| GRB_name |
GRB191225A |
| GCN_number |
26579 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
7:25:16 UTC |
| ra |
95.5000° |
| decl |
-17.4000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26579
SUBJECT: GRB 191225A: Fermi GBM Final Real-time Localization
DATE: 19/12/25 07:35:21 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely LONG GRB
At 07:25:16 UT on 25 Dec 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 191225A (trigger 598951521.49675 / 191225309).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 95.5, Dec = -17.4 (J2000 degrees, equivalent to J2000 06h 21m, -17d 23'), with a statistical uncertainty of 6.7 degrees.
The angle from the Fermi LAT boresight is 66.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191225309/quicklook/glg_skymap_all_bn191225309.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191225309/quicklook/glg_healpix_all_bn191225309.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191225309/quicklook/glg_lc_medres34_bn191225309.gif
|
| GCN 26610 table |
|---|
| GRB_name |
GRB191225A |
| GCN_number |
26610 |
| Detection_method |
AstroSat CZTI |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26610
SUBJECT: GRB 191225A : AstroSat CZTI detection
DATE: 19/12/29 09:13:02 GMT
FROM: Ramkrishna Gaikwad at IUCAA/AstroSat
R. Gaikwad, S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), 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 GRB 191225A, which was also detected by Fermi GBM Final Real-time Localization ( GCN #26579).
The source was clearly detected in the 40-200 keV energy range. The light curve shows a single peak of emission peaking at 2019-12-25 07:25:16.0 UT. The measured peak count rate associated with the burst is 241 cts/s above the background in the combined data of four quadrants, with a total of 435 cts. The local mean background count rate was 545 cts/s. Using cumulative rates, we measure a T90 of 6.9 s.
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.
|