Gamma-ray Burst 230116C

(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:     Mon 16 Jan 23 15:34:36 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1149250,   Seg_Num: 0
GRB_RA:          223.463d {+14h 53m 51s} (J2000),
                 223.785d {+14h 55m 08s} (current),
                 222.765d {+14h 51m 04s} (1950)
GRB_DEC:         -16.871d {-16d 52' 16"} (J2000),
                 -16.964d {-16d 57' 50"} (current),
                 -16.668d {-16d 40' 04"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=2150 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        19960 TJD;    16 DOY;   23/01/16
GRB_TIME:        56001.41 SOD {15:33:21.41} UT
GRB_PHI:          32.07 [deg]
GRB_THETA:        30.46 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    13.88 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +3  -5  +0 -33  +0 
SUN_POSTN:       298.24d {+19h 52m 59s}  -20.90d {-20d 54' 00"}
SUN_DIST:         69.91 [deg]   Sun_angle= 5.0 [hr] (West of Sun)
MOON_POSTN:      222.51d {+14h 50m 03s}  -16.94d {-16d 56' 11"}
MOON_DIST:         1.22 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      340.48, 36.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      226.01, -0.25 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 264.79,0.90 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 23 15:41:33 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     8388607,   Seg_Num: 0
GRB_RA:          223.463d {+14h 53m 51s} (J2000),
                 223.785d {+14h 55m 08s} (current),
                 222.765d {+14h 51m 04s} (1950)
GRB_DEC:         -16.871d {-16d 52' 16"} (J2000),
                 -16.964d {-16d 57' 50"} (current),
                 -16.668d {-16d 40' 04"} (1950)
GRB_DATE:        19960 TJD;    16 DOY;   23/01/16
GRB_TIME:        56001.41 SOD {15:33:21.41} UT
TRIGGER_INDEX:   20000
GRB_PHI:          32.07 [deg]
GRB_THETA:        30.46 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    0.00 [sigma]
LC_URL:          sw01149250000msb.lc
SUN_POSTN:       298.25d {+19h 53m 00s}  -20.90d {-20d 53' 56"}
SUN_DIST:         69.92 [deg]   Sun_angle= 5.0 [hr] (West of Sun)
MOON_POSTN:      222.57d {+14h 50m 18s}  -16.96d {-16d 57' 40"}
MOON_DIST:         1.16 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      340.48, 36.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      226.01, -0.25 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!  
COMMENTS:           
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 264.79,0.90 [deg].  
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN Circular #33173
E. Sonbas (Adiyaman Univ.), R. A. J. Eyles-Ferris (U Leicester), C. Gronwall (PSU), J.D. Gropp (PSU), A. Y. Lien (U Tampa), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Tohuvavohu (U Toronto) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 15:33:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230116C (trigger=1149250). Due to an observing constraint, Swift could not slew to the burst. The BAT on-board calculated location is RA, Dec 223.463, -16.871 which is
```
   RA(J2000) = 14h 53m 51s
   Dec(J2000) = -16d 52' 16"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Although this is an image trigger, the BAT lightcurve seems to show a complex structure starting around T-50 until a pre-planned slew away from the burst location at T+30, with a peak of ~300 counts/s (15-350 keV) near the time of the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT position until 09:10 UT on 2023 January 18. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.com). 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 #33193
A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), 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+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230116C (trigger #1149250) (Sonbas et al., GCN Circ. 33173). The BAT ground-calculated position is RA, Dec = 223.467, -16.883 deg which is
```
   RA(J2000)  =  14h 53m 52.0s
   Dec(J2000) = -16d 52' 57.5"
```
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 65%.
The BAT light curve showed a complex structure with a duration of about 400 sec. T90 (15-350 keV) is 316.77 +- 52.50 sec (estimated error including systematics).
The time-averaged spectrum from T-35.86 to T+346.68 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.72 +- 0.14. The fluence in the 15-150 keV band is 6.1 +- 0.5 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+247.71 sec in the 15-150 keV band is 0.8 +- 0.3 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/1149250/BA/

GCN Circular #33207
J. D. Gropp (PSU), S. Dichiara (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), B. Sbarufatti (INAF-OAB), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU) and A. Y. Lien (U Tampa) report on behalf of the Swift-XRT team:
We have analysed 9.4 ks of Photon Counting (PC) mode XRT data for the Swift-BAT-detected burst GRB 230116C (Lien et al. GCN Circ. 33193), collected between T0+159.6 ks and T0+537.9 ks.
Six uncatalogued X-ray sources have been detected consistent with being within 296 arcsec of the Swift-BAT position, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below:
Source 1:

  RA (J2000.0):  223.47316  =  14:53:53.56
  Dec (J2000.0): -16.91649  =  -16:54:59.4
  Error: 2.7 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: 0.0102 +/- 0.0013 ct s^-1   
  Distance: 167 arcsec from Swift-BAT position.
  Flux: (3.43 [+0.44, -0.43])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 2:

  RA (J2000.0):  223.4729  =  14:53:53.49
  Dec (J2000.0): -16.8864  =  -16:53:11.2
  Error: 6.4 arcsec (radius, 90% conf.)
  Count-rate: (2.80 [+1.09, -0.88])e-3 ct s^-1	 
  Distance: 65 arcsec from Swift-BAT position.

Source 3:

  RA (J2000.0):  223.4516  =  14:53:48.38
  Dec (J2000.0): -16.9158  =  -16:54:56.8
  Error: 6.8 arcsec (radius, 90% conf.)
  Count-rate: (3.15 [+0.84, -0.69])e-3 ct s^-1	 
  Distance: 165 arcsec from Swift-BAT position.
  Flux: (1.45 [+0.39, -0.32])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 8:

  RA (J2000.0):  223.4602  =  14:53:50.44
  Dec (J2000.0): -16.8420  =  -16:50:31.2
  Error: 6.3 arcsec (radius, 90% conf.)
  Count-rate: (1.79 [+0.90, -0.70])e-3 ct s^-1	 
  Distance: 104 arcsec from Swift-BAT position.

Source 9:

  RA (J2000.0):  223.4090  =  14:53:38.16
  Dec (J2000.0): -16.9156  =  -16:54:56.0
  Error: 8.1 arcsec (radius, 90% conf.)
  Count-rate: (8.7 [+5.4, -4.3])e-4 ct s^-1   
  Distance: 245 arcsec from Swift-BAT position.

Source 15:

  RA (J2000.0):  223.4391  =  14:53:45.37
  Dec (J2000.0): -16.8309  =  -16:49:51.2
  Error: 8.7 arcsec (radius, 90% conf.)
  Count-rate: (5.7 [+4.3, -3.4])e-4 ct s^-1   
  Distance: 166 arcsec from Swift-BAT position.

Eleven uncatalogued sources were also detected too far from the GRB position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/01149250.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 23-Jan-2023 [Disclaimer]