TITLE:   GCN CIRCULAR
NUMBER:  33641
SUBJECT: GRB 230414B: Osservatorio Astronomico Nastro Verde - Sorrento: optical observations
DATE:    23/04/18 16:26:54 GMT
FROM:    Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>

I imaged the field of GRB 230414B detected by SWIFT(trigger 1164180)
with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of: 
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.
AstroCampania Associazione

The observations started at 20:28 UT of  2023/04/14
with principal telescope  SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME
I took 12 image of 180 sec each. All images are unfiltered stacked with Tycho Tracker software
.

Start T0+                End T0+      
20:28:53 UT         21;26:21 UT

I 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 22.73s 
DEC(J2000.0) = +53° 09' 15.3"

The results of our photometry are:

-----------------------------------------    
    Date UT               CR-mag   
    Middle                  +/- 0.05
-----------------------------------------
2460049.354	19.760887
2460049.359	19.691675
2460049.361	19.481389
2460049.363	19.618392
2460049.365	19.760087
2460049.367	19.909645
2460049.37	19.739394
2460049.374	19.071181
2460049.388	19.378857
2460049.394	21.82892

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

Magnitudes were estimated with the Gaia DR2 cat. and 
are not corrected for galactic dust extinction.



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