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GCN Circular 33539

Subject
GRB 230328B NUTTelA-TAO / BSTI Early Measurements
Date
2023-03-29T18:00:30Z (2 years ago)
From
Toktarkhan Komesh at Nazarbayev University <toktarkhan.komesh@nu.edu.kz>
T. Komesh (NU), Zh. Maksut (NU), B. Grossan (UCB, NU), Zh. Abdullayev (NU), M. Krugov (FAI), report on behalf of the Energetic Cosmos Laboratory:

The Nazarbayev University Transient Telescope at Assy-Turgen Astrophysical Observatory (NUTTelA-TAO) pointed at GRB230328B on receipt of an automated GCN / BAT position alert, observing in Sloan g', r' and i' bands, with the Burst Simultaneous Three-Channel Imager (BSTI; Grossan, Kumar & Smoot 2019, JHEA, 32, 14).

We started observations at UT 2023-03-28 14:55:23, 41 s after the BAT trigger. Observations were made under clear conditions. A new and changing source consistent with the XRT position (Osborne 2023, GCN 33529) was detected. Note that these observations provide essentially full-time coverage, simultaneous in all three bands. We report the following photometric values for the OT:


tc-t0(s)  g'(mag)   exposure_time (s)                               
--------    -------    --------   
 68       17.1     54
 125     17.1     60       
 185     17.5     60       
 245     17.6     60       
 305     18.0     60       
 365     18.0     60       
 440     18.6     90       
 530     18.8     90       
 620     19.1     90       
 725     19.1     120       
 845     19.8     120       
 965     17.7     120       

 tc-t0(s)    r'(mag)    i'(mag)      exposure_time (s)
------    --------     ------          -------
45       16.5        16.1              7.5
53       16.5        15.9              7.5
60       16.4        16.0              7.5
68       16.8        16.0              7.5
75       16.4        15.9              7.5
83       16.6        16.1              7.5
90       16.5        15.9              7.5
119      16.8        16.1               15
134      16.7        16.2               15
149      16.6        16.2               15
164      17.0        16.3               15
179      16.8        16.3               15
194      17.0        16.3               15
209      16.8        16.6               15
224      17.0        16.8               15
239      17.2        16.7               15
254      17.2        16.8               15
269      17.3        16.7               15
284      17.2        16.8               15
299      17.2        16.9               15
314      17.2        17.1               15
329      17.4        17.1               15
344      17.5        16.9               15
359      17.6        17.3               15
374      17.4        16.9               15
389      17.6        17.6               15
404      17.8        17.1               15
419      17.8        16.9               15
434      17.5        17.1               15
449      17.6        17.3               15
464      17.8        17.4               15
479      17.4        17.0               15
494      18.1        17.1               15
509      17.5        17.3               15
524      17.7        17.1               15
539      18.4        17.5               15
554      17.6        17.2               15
569      17.9        17.7               15
584      18.0        17.2               15
599      17.6        17.6               15
614      17.7        17.4               15
629      17.8        17.5               15
644      17.6        17.2               15
659      17.8        17.5               15
674      17.6        17.6               15
689      18.1        17.3               15
704      18.0        17.5               15
719      17.8        17.5               15
734      17.9        17.5               15
749      18.1        17.3               15
764      18.1        17.3               15
779      18.2        17.8               15
794      18.0        17.6               15
809      18.3        17.5               15
824      18.5        17.5               15
839      18.2        17.4               15
854      18.1        17.4               15
869      18.0        18.4               15
884      17.8        17.8               15
899      18.4        17.8               15
914      18.4        17.1               15
929      17.9        18.1               15
944      17.8        17.3               15
959      18.3        18.3               15
974      18.1        17.1               15
989      18.1        17.9               15
1004     18.3        17.6               15


Uncertainties are estimated at ~ 0.1 mag for all three filters except the latest images of g��� with indications of errors ~ 0.15 mag. tc-t0 = trigger time minus image center time. Calibration was done with 3-4 bright Pan-STARRS catalog stars on our images, and no other analysis or corrections.

We caution the reader that these are preliminary results, without color or other corrections, and will likely change in small measure. Please also note that times are approximate.

----------------------------------
NU = Nazarbayev University, Nur-Sultan, Kazakhstan
UCB = University of California, Berkeley, USA
FAI = Fesenkov Astrophysical Institute, Kazakhstan

This research has been funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP14870504). The NUTTelA-TAO Team acknowledges the support of the staff of the Assy-Turgen Astrophysical Observatory, Almaty, Kazakhstan, and the Fesenkov Astrophysical Institute, Almaty, Kazkhstan.
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