Gamma-ray Burst 200701A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jul 20 12:47:33 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     980421,   Seg_Num: 0
GRB_RA:          123.555d {+08h 14m 13s} (J2000),
                 123.793d {+08h 15m 10s} (current),
                 122.974d {+08h 11m 54s} (1950)
GRB_DEC:         -14.494d {-14d 29' 37"} (J2000),
                 -14.557d {-14d 33' 24"} (current),
                 -14.341d {-14d 20' 27"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5360 [cnts]    Image_Peak=193 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   473     E_range: 25-100 keV
BKG_INTEN:       52377 [cnts]
BKG_TIME:        45982.79 SOD {12:46:22.79} UT
BKG_DUR:         24 [sec]
GRB_DATE:        19031 TJD;   183 DOY;   20/07/01
GRB_TIME:        46019.07 SOD {12:46:59.07} UT
GRB_PHI:         -65.22 [deg]
GRB_THETA:        19.61 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.00 [sigma]
IMAGE_SIGNIF:    7.22 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -3 -100  +0 -72  +0 
SUN_POSTN:       101.03d {+06h 44m 07s}  +23.05d {+23d 02' 55"}
SUN_DIST:         43.71 [deg]   Sun_angle= -1.5 [hr] (East of Sun)
MOON_POSTN:      230.96d {+15h 23m 50s}  -15.43d {-15d 26' 00"}
MOON_DIST:       102.03 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:      235.63, 10.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      129.87,-33.41 [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 = 356.28,-0.71 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jul 20 12:50:26 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     980421,   Seg_Num: 0
GRB_RA:          123.555d {+08h 14m 13s} (J2000),
                 123.793d {+08h 15m 10s} (current),
                 122.974d {+08h 11m 54s} (1950)
GRB_DEC:         -14.494d {-14d 29' 37"} (J2000),
                 -14.557d {-14d 33' 24"} (current),
                 -14.341d {-14d 20' 27"} (1950)
GRB_DATE:        19031 TJD;   183 DOY;   20/07/01
GRB_TIME:        46019.07 SOD {12:46:59.07} UT
TRIGGER_INDEX:   473
GRB_PHI:         -65.22 [deg]
GRB_THETA:        19.61 [deg]
DELTA_TIME:      51.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.00 [sigma]
IMAGE_SIGNIF:    7.22 [sigma]
LC_URL:          sw00980421000msb.lc
SUN_POSTN:       101.03d {+06h 44m 08s}  +23.05d {+23d 02' 54"}
SUN_DIST:         43.71 [deg]   Sun_angle= -1.5 [hr] (East of Sun)
MOON_POSTN:      230.99d {+15h 23m 56s}  -15.44d {-15d 26' 34"}
MOON_DIST:       102.05 [deg]
MOON_ILLUM:      84 [%]
GAL_COORDS:      235.63, 10.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      129.87,-33.41 [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 = 356.28,-0.71 [deg].

GCN Circular #28052
M. G. Bernardini (INAF-OAB), S. D. Barthelmy (GSFC), P. D'Avanzo (INAF-OAB), J.D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB), K. L. Page (U Leicester), T. Sbarrato (INAF-OAB), B. Sbarufatti (PSU) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 12:46:59 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200701A (trigger=980421). Swift did not slew immediately due to a Sun observing constraint. The BAT on-board calculated location is RA, Dec 123.555, -14.494 which is
```
   RA(J2000) = 08h 14m 13s
   Dec(J2000) = -14d 29' 37"
```
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 ~1000 counts/sec (15-350 keV), at ~1 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT position until 06:11 UT on 2020 September 07. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is M. G. Bernardini (grazia.bernardini AT brera.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 #28053
C. Malacaria (NASA-MSFC/USRA) reports on behalf of the Fermi-GBM Team:
Swift-BAT detected GRB 200701A at 12:46:59 UT (Bernardini et al. 2020, GCN 28052). There was no Fermi-GBM onboard trigger around the event. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterparts.
The GBM targeted search [1], the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around BAT trigger time. A transient source was identified whose most significant timescale according to the search is 8.192 s, with a log likelihood ratio of 39.
The location is consistent with that from Swift-BAT. The spectrum is consistent with a "normal" GRB template (Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3).
[1] Goldstein et al. 2019 arXiv:1903.12597
GCN Circular #28054
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), M. G. Bernardini (INAF-OAB), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200701A (trigger #980421) (Bernardini et al., GCN Circ. 28052). The BAT ground-calculated position is RA, Dec = 123.563, -14.553 deg which is
```
   RA(J2000)  =  08h 14m 15.2s
   Dec(J2000) = -14d 33' 09.8"
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 77%.
The mask-weighted light curve shows a single-pulse structure that starts at ~T-7 s and peaks at ~T0. The main pulse ends at ~T+20 s, followed by a weak tail that lasts till ~T+40 s. T90 (15-350 keV) is 38.9 +- 8.6 sec (estimated error including systematics).
The time-averaged spectrum from T-6.81 to T+42.17 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.91 +- 0.16. The fluence in the 15-150 keV band is 9.3 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-1.72 sec in the 15-150 keV band is 0.7 +- 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/980421/BA/

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Jochen Greiner, last update: 01-Jul-2022 [Disclaimer]