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GCN Circular 33630

Subject
GRB 230414B: Bassano Bresciano Observatory optical observations
Date
2023-04-15T14:51:21Z (a year ago)
From
Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>
U.Quadri, L.Strabla report:

We imaged the field of GRB 230414B detected by SWIFT(trigger 1164180)
with the robotic telescope of (IAU station 565) Bassano Bresciano 
Observatory, Italy. Member of: 
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.

The observations started 236.82 min min after the GRB trigger, at the end of twilight, 
with our Newton telescope D=250 mm F/D=4.8.

We co-added 6 series of 30 exposures of 60 sec each.

Start T0+      End T0+      Vlim
236.82 min   323.07 min     20.5

We detected a (fading) afterglow in the error box of the XRTcandidate.
A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), et al.
at the following position (+/- 2 arcsec):

RA (J2000.0) =  12h 04m 22.64s 
DEC(J2000.0) = +53�� 09' 16.4"

The results of our photometry are:

-----------------------------------------    
    Date UT               CR-mag   
    Middle                  +/- 0.05
-----------------------------------------
2023 04 14.85273            19.76
2023 04 14.86022            19.74
2023 04 14.86771            19.76
2023 04 14.87519            20.02
2023 04 14.88268            19.96
2023 04 14.89017            20.01

-----------------------------------------

Magnitudes were estimated with the UCAC4 cat. and 
are not corrected for galactic dust extinction.

The images are available at:
http://www.osservatoriobassano.org/GRB.asp

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