Gamma-ray Burst 220501A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 May 22 19:52:11 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1104842,   Seg_Num: 0
GRB_RA:           85.577d {+05h 42m 18s} (J2000),
                  85.894d {+05h 43m 35s} (current),
                  84.867d {+05h 39m 28s} (1950)
GRB_DEC:         +14.033d {+14d 02' 00"} (J2000),
                 +14.043d {+14d 02' 34"} (current),
                 +14.010d {+14d 00' 37"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3195 [cnts]    Image_Peak=197 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       15983 [cnts]
BKG_TIME:        71498.93 SOD {19:51:38.93} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19700 TJD;   121 DOY;   22/05/01
GRB_TIME:        71511.22 SOD {19:51:51.22} UT
GRB_PHI:         -69.25 [deg]
GRB_THETA:        12.61 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     23.83 [sigma]
IMAGE_SIGNIF:    8.97 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  -1 -100  +1 -70  +0 
SUN_POSTN:        38.99d {+02h 35m 58s}  +15.26d {+15d 15' 22"}
SUN_DIST:         45.31 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:       49.89d {+03h 19m 34s}  +18.46d {+18d 27' 25"}
MOON_DIST:        34.79 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      192.38, -8.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       85.65, -9.34 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 263.54,12.40 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=673127515).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 01 May 22 19:52:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      60
TRIGGER_NUM:     673127515
GRB_RA:           83.767d {+05h 35m 04s} (J2000),
                  84.053d {+05h 36m 13s} (current),
                  83.127d {+05h 32m 30s} (1950)
GRB_DEC:          -0.067d {-00d 04' 00"} (J2000),
                  -0.054d {-00d 03' 12"} (current),
                  -0.098d {-00d 05' 54"} (1950)
GRB_ERROR:       10.93 [deg radius, statistical plus systematic]
GRB_INTEN:       136 [cnts/sec]
DATA_SIGNIF:     12.10 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19700 TJD;   121 DOY;   22/05/01
GRB_TIME:        71510.74 SOD {19:51:50.74} UT
GRB_PHI:         314.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.48
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   4%  GRO_J0422_32
DETECTORS:       0,0,0, 0,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        38.99d {+02h 35m 58s}  +15.26d {+15d 15' 22"}
SUN_DIST:         47.06 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:       49.89d {+03h 19m 34s}  +18.46d {+18d 27' 24"}
MOON_DIST:        38.32 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      204.02,-16.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       83.21,-23.36 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220501828/quicklook/glg_lc_medres34_bn220501828.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 235.30,-25.65 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 01 May 22 19:51:54 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     673127515
GRB_RA:           74.983d {+04h 59m 56s} (J2000),
                  75.295d {+05h 01m 11s} (current),
                  74.287d {+04h 57m 09s} (1950)
GRB_DEC:         +11.850d {+11d 50' 60"} (J2000),
                 +11.882d {+11d 52' 55"} (current),
                 +11.776d {+11d 46' 34"} (1950)
GRB_ERROR:       24.25 [deg radius, statistical plus systematic]
GRB_INTEN:       172 [cnts/sec]
DATA_SIGNIF:     7.70 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19700 TJD;   121 DOY;   22/05/01
GRB_TIME:        71510.74 SOD {19:51:50.74} UT
GRB_PHI:         325.00 [deg]
GRB_THETA:        90.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.48
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      89%  GRB
2nd_MOST_LIKELY:   7%  GRO_J0422_32
DETECTORS:       0,0,0, 0,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        38.99d {+02h 35m 58s}  +15.26d {+15d 15' 22"}
SUN_DIST:         35.41 [deg]   Sun_angle= -2.4 [hr] (East of Sun)
MOON_POSTN:       49.89d {+03h 19m 33s}  +18.46d {+18d 27' 22"}
MOON_DIST:        25.36 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      188.59,-18.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       75.04,-10.81 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220501828/quicklook/glg_lc_medres34_bn220501828.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 235.30,-25.65 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 01 May 22 19:52:09 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     673127515
GRB_RA:           74.810d {+04h 59m 14s} (J2000),
                  75.119d {+05h 00m 29s} (current),
                  74.118d {+04h 56m 28s} (1950)
GRB_DEC:         +10.910d {+10d 54' 36"} (J2000),
                 +10.942d {+10d 56' 32"} (current),
                 +10.835d {+10d 50' 08"} (1950)
GRB_ERROR:       6.57 [deg radius, statistical only]
DATA_SIGNIF:     11.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19700 TJD;   121 DOY;   22/05/01
GRB_TIME:        71510.74 SOD {19:51:50.74} UT
GRB_PHI:         325.00 [deg]
GRB_THETA:        89.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:        38.99d {+02h 35m 58s}  +15.26d {+15d 15' 22"}
SUN_DIST:         35.41 [deg]   Sun_angle= -2.4 [hr] (East of Sun)
MOON_POSTN:       49.89d {+03h 19m 34s}  +18.46d {+18d 27' 25"}
MOON_DIST:        25.50 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      189.31,-18.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       74.77,-11.73 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220501828/quicklook/glg_lc_medres34_bn220501828.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_673127515.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 01 May 22 20:01:08 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     673127515
GRB_RA:           71.810d {+04h 47m 14s} (J2000),
                  72.120d {+04h 48m 29s} (current),
                  71.116d {+04h 44m 28s} (1950)
GRB_DEC:         +11.500d {+11d 30' 00"} (J2000),
                 +11.538d {+11d 32' 19"} (current),
                 +11.411d {+11d 24' 41"} (1950)
GRB_ERROR:       6.26 [deg radius, statistical only]
GRB_DATE:        19700 TJD;   121 DOY;   22/05/01
GRB_TIME:        71510.74 SOD {19:51:50.74} UT
GRB_PHI:         328.00 [deg]
GRB_THETA:        89.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:        39.00d {+02h 35m 59s}  +15.26d {+15d 15' 29"}
SUN_DIST:         32.41 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.97d {+03h 19m 52s}  +18.48d {+18d 28' 60"}
MOON_DIST:        22.47 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      187.02,-21.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       71.86,-10.80 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220501828/quicklook/glg_lc_medres34_bn220501828.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220501828/quicklook/glg_locplot_all_bn220501828.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1104842).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 May 22 19:55:58 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1104842,   Seg_Num: 0
GRB_RA:           85.577d {+05h 42m 18s} (J2000),
                  85.894d {+05h 43m 35s} (current),
                  84.867d {+05h 39m 28s} (1950)
GRB_DEC:         +14.033d {+14d 02' 00"} (J2000),
                 +14.043d {+14d 02' 34"} (current),
                 +14.010d {+14d 00' 37"} (1950)
GRB_DATE:        19700 TJD;   121 DOY;   22/05/01
GRB_TIME:        71511.22 SOD {19:51:51.22} UT
TRIGGER_INDEX:   155
GRB_PHI:         -69.25 [deg]
GRB_THETA:        12.61 [deg]
DELTA_TIME:      51.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     23.83 [sigma]
IMAGE_SIGNIF:    8.97 [sigma]
LC_URL:          sw01104842000msb.lc
SUN_POSTN:        38.99d {+02h 35m 58s}  +15.26d {+15d 15' 25"}
SUN_DIST:         45.31 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:       49.92d {+03h 19m 42s}  +18.47d {+18d 28' 05"}
MOON_DIST:        34.76 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      192.38, -8.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       85.65, -9.34 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 263.54,12.40 [deg].

GCN Circular #31982
A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), C. Gronwall (PSU), A. Y. Lien (U Tampa), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 19:51:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 220501A (trigger=1104842). Swift did not slew to the burst location due to an observing constraint. The BAT on-board calculated location is RA, Dec 85.577, +14.033 which is
```
   RA(J2000) = 05h 42m 18s
   Dec(J2000) = +14d 02' 00"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 60 sec. The peak count rate was ~2500 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT position until 07:38 UT on 2022 August 04. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is A. D'Ai (antonino.dai AT inaf.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/)
GCN Circular #31983
The Fermi GBM team reports the detection of a likely LONG GRB
At 19:51:50 UT on 1 May 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220501A (trigger 673127515.736396 / 220501828).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 71.8, Dec = 11.5 (J2000 degrees, equivalent to J2000 04h 47m, 11d 30'), with a statistical uncertainty of 6.3 degrees.
The angle from the Fermi LAT boresight is 89.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220501828/quicklook/glg_skymap_all_bn220501828.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/bn220501828/quicklook/glg_healpix_all_bn220501828.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220501828/quicklook/glg_lc_medres34_bn220501828.gif
GCN Circular #31984
A. Klotz (CNRS-OMP-IRAP), A. de Ugarte Postigo, S. Antier (both CNRS-OCA-ARTEMIS), D. Dornic (CPPM), A. Sabahaddin (ShaO),T. Midavaine (KNC), V. Rupchandani (AUS), P. A. Duverne (IJCLAB), Y. Rajabov (UBAI), X. Song (BJP), X. F. Wang (THU/BJP), J. Zhu (BJP), L. Wang, X. Zeng, A. Iskandar (XAO), and D. A. Kann (IAA-CSIC) report on behalf of the GRANDMA collaboration:
We observed the BAT error circle of GRB 220501A (D'Ai et al., GCN 31982; Fermi GBM Team, GCN 31983) with the TJML 11" Celestron telescope installed at Guitalens observatory. We recorded a stack of 8 x 60 s unfiltered images in the range from 28.8 to 38.9 minutes after the trigger.
We did not detect any optical counterpart of GRB 220501A in the BAT error circle to a limiting magnitude r(AB) > 16.0 mag. Photometry was calibrated against the Pan-STARRS catalog.
GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).
GCN Circular #31988
O.J. Roberts (USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 19:51:50.74 UT on 01 May 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220501A (trigger 673127515 / 220501828), which was also detected by Swift/BAT (A. D'Ai et al. 2022, GCN 31982). The Fermi GBM Final Real-time Localization (GCN 31983) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 94 degrees.
The GBM light curve shows a FRED-like burst with a duration (T90) of about 51 s (50-300 keV). The time-averaged spectrum from T0-3.6 s to T0+47.6 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.49 +/- 0.18 and the cutoff energy, parameterized as Epeak, is 114 +/- 11 keV
The event fluence (10-1000 keV) in this time interval is (3.53 +/- 0.24)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.0 s in the 10-1000 keV band is 2.5 +/- 0.2 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/"
GCN Circular #31990
Y.-D. Hu, E. Fernandez-Garcia, T.-R. Sun, A. J. Castro-Tirado, M. D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco, A. Reina (Univ. de Malaga) and F. Rendon (IAA-CSIC and INTA-CEDEA) on behalf of a larger collaboration, report:
Following the detection of GRB 220501A by Swift (D'Ai et al., GCNC 31982) and Fermi (Fermi GBM team, GCNC 31983, Roberts et al. GCNC 31988), the 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva), southern Spain, automatically responded to this burst on May 1 at 20:14 UT (~22.3 min after trigger), right after the twilight and at high airmass. In the co-added frame (38 x 10 s, clear filter), no source is detected within the BAT error position (D'Ai et al., GCNC 31982) down to 17.5 mag, which is consistent with the non-detection reported by Klotz et al. (GCNC 31984).
We thank the staff at INTA-CEDEA for their excellent support.
GCN Circular #31993
H. A. Krimm (NSF),S. D. Barthelmy (GSFC), A. D'Ai (INAF-IASFPA), 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+816 sec from the recent telemetry downlink, we report further analysis of BAT GRB 220501A (trigger #1104842) (D'Ai et al., GCN Circ. 31982). The BAT ground-calculated position is RA, Dec = 85.583, 14.010 deg which is
```
   RA(J2000)  =  05h 42m 20.0s
   Dec(J2000) = +14d 00' 36.5"
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 92%.
The mask-weighted light curve shows a FRED-like pulse that starts at ~T-1 s and peaks at ~T+5 s. It is followed by a second weak pulse at ~T+200 s. T90 (15-350 keV) is 202.24 +- 20.60 sec (estimated error including systematics).
The time-averaged spectrum from T-1.21 to T+224.20 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.64 +- 0.62, and Epeak of 72.3 +- 28.6 keV (chi squared 44.65 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 2.2 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+4.28 sec in the 15-150 keV band is 1.2 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.54 +- 0.13 (chi squared 52.35 for 57 d.o.f.). 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/1104842/BA/

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Jochen Greiner, last update: 03-May-2022 [Disclaimer]