GCN Circular 35296
Subject
GRB231115A: TURBO Pre-Burst Optical Upper Limits
Date
2023-12-06T21:42:43Z (5 months ago)
From
Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>
Via
email
R. Strausbaugh (Eastern Illinois University), Daniel Warshofsky (UMN), Pat Kelly (UMN), Mandeep S. S. Gill (UMN), Alexandre Toscano (UMN), Yilin Lu(UMN), Sydney Leggio (UMN), Aksinya Kamenshikova (UMN) report on behalf of a larger collaboration:
We observed M82, including the localization region for the Fermi GRB 231115A (Fermi GBM team, GCN 35035), with the Total-Coverage Ultrafast Response to Binary-Mergers Observatory (TURBO) prototype telescope in St. Paul, Minnesota, USA, as part of a high-cadence ongoing survey for transients in nearby galaxies. We visited the field 55 times on November 15 UT, with the last visit occurring at 9:06 UT in SDSS r and g bands respectively (corresponding to 6.5 hours before the GRB trigger time).
Each exposure is 30 seconds. We do not detect a source at the same location as the GROWTH-India counterpart (Kumar et al., GCN 35041) in either band.
The 3-sigma upper limits in the table below are calculated using the Pan-STARRS catalog as reference, and are not corrected for Galactic extinction.
The TURBO prototype in St. Paul consists of two co-mounted 11-inch telescopes each with a 6.6 square degree field of view.
TURBO, which is under construction, will consist of two arrays of 8 pairs of co-mounted 11-inch telescopes at two dark-sky sites: Magdalena Ridge Observatory, New Mexico, USA and Skinakas Observatory, Crete, Greece.
mjd
g upper limit (AB)
r upper limit (AB)
60262.97035880
-
16.0
60262.97244213
16.9
-
60263.00063657408
-
15.9
60263.00407407407
-
15.7
60263.007106481484
-
16.1
60263.012094907404
-
15.6
60263.015555555554
-
15.9
60263.01940972222
-
16.0
60263.02327546296
-
15.9
60263.02715277778
-
16.3
60263.03057870371
-
16.1
60263.034212962964
-
16.1
60263.03765046296
-
16.4
60263.04111111111
-
15.7
60263.04293981481
-
15.8
60263.04591435185
16.5
15.7
60263.04896990741
-
16.4
60263.05202546297
16.5
15.8
60263.055
16.5
15.6
60263.058020833334
-
15.8
60263.061006944445
-
16.0
60263.06407407407
-
15.9
60263.070497685185
-
16.3
60263.07403935185
-
16.2
60263.07748842592
-
15.8
60263.080462962964
-
16.3
60263.08472222222
-
16.1
60263.087592592594
16.5
16.4
60263.09365740741
16.4
16.3
60263.09645833333
15.9
16.5
60263.099375
-
16.4
60263.1171412037
-
16.7
60263.120150462964
16.3
16.3
60263.12315972222
-
15.4
60263.14434027778
16.6
15.6
60263.14716435185
16.0
15.7
60263.15039351852
15.7
16.1
60263.15372685185
16.5
16.0
60263.156539351854
15.8
16.0
60263.159421296295
16.0
16.3
60263.162314814814
16.6
15.8
60263.165138888886
15.8
16.8
60263.16957175926
16.3
16.2
60263.172997685186
16.4
-
60263.176516203705
16.5
16.5
60263.19818287037
16.8
15.8
60263.21885416667
16.9
16.8
60263.22230324074
17.4
17.0
60263.24633101852
17.3
16.4
60263.268900462965
17.3
16.6
60263.27537037037
16.9
16.9
60263.27885416667
17.3
17.0
60263.283229166664
17.0
16.9
60263.28666666667
16.9
17.0
60263.29603009259
17.4
16.8