Gamma-ray Burst 201203A

(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:     Thu 03 Dec 20 06:53:30 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1010946,   Seg_Num: 0
GRB_RA:           38.080d {+02h 32m 19s} (J2000),
                  38.312d {+02h 33m 15s} (current),
                  37.525d {+02h 30m 06s} (1950)
GRB_DEC:         -26.538d {-26d 32' 14"} (J2000),
                 -26.446d {-26d 26' 44"} (current),
                 -26.757d {-26d 45' 26"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       29887 [cnts]    Image_Peak=570 [image_cnts]
TRIGGER_DUR:     12.160 [sec] 
TRIGGER_INDEX:   478     E_range: 25-100 keV
BKG_INTEN:       143800 [cnts]
BKG_TIME:        24653.91 SOD {06:50:53.91} UT
BKG_DUR:         64 [sec]
GRB_DATE:        19186 TJD;   338 DOY;   20/12/03
GRB_TIME:        24747.16 SOD {06:52:27.16} UT
GRB_PHI:         -129.60 [deg]
GRB_THETA:        16.76 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.00 [sigma]
IMAGE_SIGNIF:    8.40 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +2  -1  +0  +0 +53  +0 
SUN_POSTN:       250.04d {+16h 40m 10s}  -22.17d {-22d 10' 05"}
SUN_DIST:        122.49 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      105.70d {+07h 02m 49s}  +24.82d {+24d 49' 01"}
MOON_DIST:        82.79 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      217.22,-67.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       25.01,-39.01 [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 = 288.17,-0.52 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Thu 03 Dec 20 06:54:33 UT 
NOTICE_TYPE:     Swift-XRT Nack-Position 
TRIGGER_NUM:     1010946,   Seg_Num: 0 
POINT_RA:         38.081d {+02h 32m 20s} (J2000) 
POINT_DEC:       -26.530d {-26d 31' 47"} (J2000) 
IMG_START_DATE:  19186 TJD;   338 DOY;   20/12/03 
IMG_START_TIME:  24867.23 SOD {06:54:27.23} UT,   120.1 [sec] since BAT Trigger Time 
COUNTS:          1    Min_needed= 20 
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec] 
PH2_ITER:        0    Max_iter_allowed= 4 
ERROR_CODE:      1 
COMMENTS:        SWIFT-XRT Nack Position.   
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 03 Dec 20 06:56:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1010946,   Seg_Num: 0
POINT_RA:         38.081d {+02h 32m 20s} (J2000)
POINT_DEC:       -26.530d {-26d 31' 47"} (J2000)
POINT_ROLL:      215.453d
IMG_START_DATE:  19186 TJD;   338 DOY;   20/12/03
IMG_START_TIME:  24870.80 SOD {06:54:30.80} UT,   123.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.733
N_STARS:         15
X_OFFSET:        517 [pixels]
Y_OFFSET:        496 [pixels]
X_MAX:           1476 [pixels]
Y_MAX:           1455 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw01010946000msufc0123.fits
SUN_POSTN:       250.04d {+16h 40m 11s}  -22.17d {-22d 10' 06"}
SUN_DIST:        122.50 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      105.73d {+07h 02m 54s}  +24.82d {+24d 48' 60"}
MOON_DIST:        82.80 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      217.20,-67.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.02,-39.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 03 Dec 20 06:56:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1010946,   Seg_Num: 0
POINT_RA:         38.081d {+02h 32m 20s} (J2000)
POINT_DEC:       -26.530d {-26d 31' 47"} (J2000)
POINT_ROLL:      215.453d
IMG_START_DATE:  19186 TJD;   338 DOY;   20/12/03
IMG_START_TIME:  24870.80 SOD {06:54:30.80} UT,   123.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.733
N_STARS:         15
X_OFFSET:        517 [pixels]
Y_OFFSET:        496 [pixels]
X_MAX:           1476 [pixels]
Y_MAX:           1455 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw01010946000msufc0123.fits
SUN_POSTN:       250.04d {+16h 40m 11s}  -22.17d {-22d 10' 06"}
SUN_DIST:        122.50 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      105.73d {+07h 02m 55s}  +24.82d {+24d 48' 60"}
MOON_DIST:        82.80 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      217.20,-67.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.02,-39.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 03 Dec 20 06:57:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1010946,   Seg_Num: 0
POINT_RA:         38.081d {+02h 32m 20s} (J2000)
POINT_DEC:       -26.530d {-26d 31' 47"} (J2000)
ROLL:            215.453d
IMG_START_DATE:  19186 TJD;   338 DOY;   20/12/03
IMG_START_TIME:  24870.80 SOD {06:54:30.80} UT,   123.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     628671296
X_OFFSET:        836 [pixels]
Y_OFFSET:        815 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       996
Y_GRB_POS:       975
BINNING_INDEX:   1
IM_URL:          sw01010946000msuni0150.fits
SUN_POSTN:       250.05d {+16h 40m 11s}  -22.17d {-22d 10' 06"}
SUN_DIST:        122.50 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      105.74d {+07h 02m 58s}  +24.82d {+24d 48' 59"}
MOON_DIST:        82.81 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      217.20,-67.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.02,-39.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 03 Dec 20 06:58:07 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1010946,   Seg_Num: 0
GRB_RA:           38.080d {+02h 32m 19s} (J2000),
                  38.312d {+02h 33m 15s} (current),
                  37.525d {+02h 30m 06s} (1950)
GRB_DEC:         -26.538d {-26d 32' 14"} (J2000),
                 -26.446d {-26d 26' 44"} (current),
                 -26.757d {-26d 45' 26"} (1950)
GRB_DATE:        19186 TJD;   338 DOY;   20/12/03
GRB_TIME:        24747.16 SOD {06:52:27.16} UT
TRIGGER_INDEX:   478
GRB_PHI:         -129.60 [deg]
GRB_THETA:        16.76 [deg]
DELTA_TIME:      -44.00 [sec]
TRIGGER_DUR:     12.160 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.00 [sigma]
IMAGE_SIGNIF:    8.40 [sigma]
LC_URL:          sw01010946000msb.lc
SUN_POSTN:       250.05d {+16h 40m 11s}  -22.17d {-22d 10' 07"}
SUN_DIST:        122.49 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      105.75d {+07h 02m 59s}  +24.82d {+24d 48' 58"}
MOON_DIST:        82.82 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      217.22,-67.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       25.01,-39.01 [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 = 288.17,-0.52 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 03 Dec 20 06:57:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1010946,   Seg_Num: 0
POINT_RA:         38.081d {+02h 32m 20s} (J2000)
POINT_DEC:       -26.530d {-26d 31' 47"} (J2000)
ROLL:            215.453d
IMG_START_DATE:  19186 TJD;   338 DOY;   20/12/03
IMG_START_TIME:  24870.80 SOD {06:54:30.80} UT,   123.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     628671296
X_OFFSET:        836 [pixels]
Y_OFFSET:        815 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       996
Y_GRB_POS:       975
BINNING_INDEX:   1
IM_URL:          sw01010946000msuni0150.fits
SUN_POSTN:       250.05d {+16h 40m 11s}  -22.17d {-22d 10' 06"}
SUN_DIST:        122.50 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      105.74d {+07h 02m 58s}  +24.82d {+24d 48' 59"}
MOON_DIST:        82.82 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      217.20,-67.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       25.02,-39.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #28985
S. Dichiara (NASA/GSFC/UMCP), C. Gronwall (PSU), S. Laha (GSFC/UMBC/CRESST), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 06:52:27 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 201203A (trigger=1010946). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 38.080, -26.538 which is
```
   RA(J2000) = 02h 32m 19s
   Dec(J2000) = -26d 32' 14"
```
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 20 sec. The peak count rate was ~600 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 06:54:27.2 UT, 120.0 seconds after the BAT trigger. No source was detected in the 2.5-s promptly available image. We are waiting for the full dataset to detect and localise the XRT counterpart.
UVOT took a finding chart exposure of 68 seconds with the White filter starting 123 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is S. Dichiara (dichiara AT umd.edu). 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 #28986
Martin Jelinek, Jan Strobl (ASU CAS Ondrejov, CZ), Martin Masek, Petr Janecek, Sergey Karpov, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza (Institute of Physics, Prague, CZ)
report:
The 30 cm robotic telescope FRAM-Auger in Malargue (Argentina) reacted robotically to the Swift/BAT alert of GRB201203A (Dichiara et al., GCNC 28985), starting with a series of 20 s unfiltered images at 06:54:04 UT, i.e. 97 s post trigger.
We do not detect any new or strongly variable source at or around the reported gamma-ray errorbox in single frames or a combined 20 x 20 s image taken between 1.5 min and 12.5 min after the initial trigger. The combined exposure has a limiting magnitude r'(AB) ~ 17, as calibrated against the Atlas Catalogue.
GCN Circular #28987
Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Simone Dichiara (GSFC/UMD), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl Lopez (UNAM), Diego Gonzalez (UNAM), Margarita Pereyra (UNAM), Srihari Ravi (ASU), and Eleonora Troja (GSFC/UMD) report:
We observed the field of the Swift/BAT GRB 201203A (Dichiara et al., GCN Circ. 28985) with the DDOTI wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) from 2020-12-03 06:57 UTC to 08:31 UTC (from 5.5 to 99 minutes after the trigger).
We observed a region covering aproximately 7 degrees in RA and 10 degrees in declination (about 70 square degrees), including the entire BAT uncertainty region centered on 02:32:19.18 -26:32:15.0 (J2000). We obtained 4290 seconds of exposure in the w filter at high airmass and with almost full Moon. We calibrated our images against the APASS DR10 catalog. Our 5-sigma limiting magnitudes is 19.9.
Compared to the USNO-B1, Pan-STARRS DR1, and APASS DR10 catalogs, we detect no uncataloged sources to our 5-sigma limit in the BAT 90% uncertainty region. No XRT detection is available at this moment.
We thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.
GCN Circular #28988
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 201203A (Dichiara et al., GCN 28985) starting at 06:54:43 UT, 136 s after the burst. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per image. We do not detect any optical afterglow candidate within the BAT position error circle (Dichiara et al., GCN 28985), neither in single image, nor in the co-add images. The typical limiting magnitude of our single clear image is about 18.0 mag calibrated to the USNOB1.0 catalog. Our observation is consistent with the non-detection reported by other groups (Jelinek et al, GCN 28986; Watson et al., GCN 28987). ď»ż
GCN Circular #28990
V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), B. Sbarufatti (PSU), D.N. Burrows (PSU), J. D. Gropp (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has observed GRB 201203A (Dichiara et al. GCN Circ. 28985), collecting 2.8 ks of Photon Counting (PC) mode data between T0+4.7 ks and T0+17.6 ks.
One uncatalogued X-ray source is detected within the BAT error circle. Using 857 s of PC mode data and 2 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 38.05521, -26.51820 which is equivalent to:
```
RA (J2000): 02h 32m 13.25s
Dec(J2000): -26d 31' 05.5"
```
with an uncertainty of 3.3 arcsec (radius, 90% confidence). This position is 107 arcsec from the BAT position.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.4 (+1.3, -1.1).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.9 (+0.7, -0.4). The best-fitting absorption column is consistent with the Galactic value of 1.8 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (1.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.8 (+/-7.3) x 10^20 cm^-2
Galactic foreground: 1.8 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.9 (+0.7, -0.4)
```
If the light curve continues to decay with a power-law decay index of 1.4, the count rate at T+24 hours will be 3.4 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x 10^-14 (5.5 x 10^-15) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01010946. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/01010946.
This circular is an official product of the Swift-XRT team.
GCN Circular #28991
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 201203A ( S. Dichiara et al., GCN 28985) errorbox 41763 sec after notice time and 41845 sec after trigger time at 2020-12-03 18:29:52 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 72 deg. The sun altitude is -46.7 deg.
The galactic latitude b = -67 deg., longitude l = 217 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1494824
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   41936 |      MASTER-Tavrida |   C |   180 | 17.6 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #28992
M. Niwano, R. Hosokawa, K. L. Murata, R. Adachi, F. Ogawa, N. Nakamura, N. Ito, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 201203A (S. Dichiara et al.,GCN Circular #28985) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Okayama Astrophysical Observatory, Okayama, Japan. The observation started at 12:02:06 UT. We did not find any new point sources within the Swift-XRT circle ( V. D'Elia et al., GCN Circular #28990) in all three bands. We obtained the 5-sigma limits as follows.
```
T0+[hour] MID-UT  T-EXP[sec]  5-sigma limits
----------------------------------------------------------------- 

6.9   13:45:28.19  9000   g'>17.9, Rc>18.6, Ic>17.7
----------------------------------------------------------------- 

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used the PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al., 10.1093/pasj/psaa091, arXiv:2008.11486; https://github.com/MNiwano/Eclaire).
GCN Circular #28993
H. Kumar (IITB), P. Dorje (IAO), J. Stanzin (IAO), S. Joharle (Fergusson College), K. Sharma (IITB), V. Bhalerao (IITB), G. C. Anupama (IIA), S. Barway (IIA), report on behalf of the GROWTH-India collaboration:
We observed GRB 201203A reported by S. Dichiara et. al., (GCN 28985) with 0.7m GROWTH-India Telescope, starting at 2020-12-03T15:21:51.55 UT. We obtained 25 images of 300 sec each in the r' filter. We did not detect any new source within an uncertainty region of 3.3 arcseconds (radius, 90% containment) around Swift-XRT position i.e., RA(J2000) = 02h 32m 13.25s, Dec(J2000) = -26d 31' 05.5" (V. D'Elia et. al., GCN 28990).
We obtained the following upper limits:
```
------------------------------------------------------------------
 JD_Mid | T_mid-T0 (hrs) | Exposure(sec) | Filter | lim_Mag |
------------------------------------------------------------------
2459187.19431 | ~8.49 | 300*25 | r' | > 21.7 |
------------------------------------------------------------------
```
Magnitudes are in the AB system and are calibrated against PanSTARRs PS1 data release, (Flewelling et al., 2018).
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).
GCN Circular #28995
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), S. Dichiara (NASA/GSFC/UMCP), 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-239 to T+130 sec from the recent telemetry downlink, we report further analysis of BAT GRB 201203A (trigger #1010946) (Dichiara et al., GCN Circ. 28985). The BAT ground-calculated position is RA, Dec = 38.055, -26.505 deg which is
```
   RA(J2000)  =  02h 32m 13.1s
   Dec(J2000) = -26d 30' 19.2"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 91%.
The BAT light curve showed a complex structure with a duration of about ~20 sec. T90 (15-350 keV) is 12.18 +- 2.10 sec (estimated error including systematics).
The time-averaged spectrum from T-2.73 to T+12.84 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.26. The fluence in the 15-150 keV band is 2.9 +- 0.5 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+11.49 sec in the 15-150 keV band is 0.5 +- 0.1 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/1010946/BA/
GCN Circular #29030
Amit Kumar (ARIES), Rahul Gupta (ARIES), Raya Dastidar (ARIES), Dimple (ARIES), Ankur Ghosh (ARIES), Sapna Mishra (ARIES), Amar Aryan (ARIES), Shashi B. Pandey (ARIES), and Kuntal Misra (ARIES) report:
We observed the field of Swift discovered GRB 201203A (Dichiara et al., GCN 28985, D'Elia et al., GCN 28990) with the 1.3m Devasthal Fast Optical Telescope (DFOT) at Devasthal observatory of Aryabhatta Research Institute of Observational Sciences (ARIES), India. We observed a series of images ~7.774 hours after the burst in both R and I (300sx6 in each) filters (Johnson-Cousins) covering Swift UVOT position (Sakamoto et al., GCN 28995). Preliminary photometry on the stacked images was performed and calibrated against USNO-B1 catalog stars. We do not detect any OT candidate (Jelinek et al., GCN 28986, Watson et al., GCN 28987, Zheng et al., 28988, Niwano et al., GCN 28992, Kumar et al. 28993) within the enhanced XRT position. The upper limits in the stacked images are the following:
```
DATE       UT (start)  Filter Exposure(sec) Frames    Upper limit (mag)
2020-12-03 14:38:54    R      300           6        21.4
2020-12-03 15:11:18    I        300           6        21.2
```
This circular may be cited.
GCN Circular #29032
N. Pankov (HSE), A. Zhornichenko (KIAM), A. Pozanenko (IKI), A. Novichonok (Petrozavodsk State University, KIAM), S. Belkin (IKI), report on behalf of IKI GRB FuN:
We observed the field of GRB 201203A (Dichiara et al., GCN 28985) with Zeiss-1000 telescope of Koshka observatory starting on Dec. 03 (UT) 20:50:46. We do not detect any optical source within XRT position (D'Elia et al., GCN 28990) in agreement with previous observations (Jelinek et al., GCN 28986, Watson et al., GCN 28987, Zheng et al., 28988, Niwano et al., GCN 28992, Kumar et al. GCN 28993; Kumar et al. GCN29030)
Preliminary photometry of the field is following
```
Date       UT start   t-T0       Filter Exp.    OT    Err.  UL(3sigma)
                       (mid, days)        (s)

2020-12-03 20:50:46   0.58216    R      120*25   n/d  n/d   20.5
```
The photometry is based on the nearby USNO-B1.0 stars
```
USNO-B1.0_id R2
USNO_B10_0634-0041449
USNO_B10_0634-0041608
USNO_B10_0634-0041460
USNO_B10_0635-0033957
```

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Jochen Greiner, last update: 12-Dec-2020 [Disclaimer]