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GCN Circular 33660

Subject
GRB230414B: VIRT Optical Upper Limit
Date
2023-04-20T18:02:52Z (5 months ago)
From
Priya Gokuldass at Florida Tech <pgokuldass2020@my.fit.edu>
N. Orange (OrangeWave Innovative Science, LLC), K. Smith (UVI), R. Querrard (UVI), H. Zimmerman (UVI), D. Morris (UVI), P. Gokuldass (Florida Tech), and K. Noonan (UVI) report:

We observed the field of GRB230414B (D'Ai et al. GCN 33612; Evans et al. GCN 33613) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 04-16-2023 starting at 01:37:00 UT (T+33.4 hrs). We performed a series of exposures in R filter with a total exposure of 2900 s. The weather conditions were mixed during the hours of observation with an average airmass of ~1.3.

We do not detect the source identified by others (Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618; Ghosh et al., GCN 33620; Moskvitin et al., GCN 33622; Malesani et al., GCN 33623; Zhu et al., GCN 33625; Belkin et al., GCN 33628; Fernandez et al., GCN 33629; Quadri et al., GCN 33630; Leonini et al., GCN 33634; Ror et al., GCN 33636; Querrard et al., GCN 33637; Ruocco, GCN 33641; LaPorte et al., GCN 33642; Risin et al., GCN 33648) and report the following 3-sigma upper limit:

T_mid               ||Exposure     ||Filter      ||Limit
T+35.1 hrs       ||2900s            ||R              ||>20.5

The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the
commissioning phase. 

We acknowledge financial support from NASA MUREP MIRO award 80NSSC21M0001, NASA EPSCoR award 80NSSC22M0063, and NSF EiR award 1901296. R.Q. and N.B.O. also acknowledge financial support from South Carolina Space Grant award 80NSSC20M0054. This message can be cited.
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