GRB 220302A

E. Troja (NASA/GSFC/UMCP), C. Gronwall (PSU),
K. L. Page (U Leicester), D. M. Palmer (LANL) and
T. M. Parsotan (GSFC/UMBC/CRESSTII) report on behalf of the Neil
Gehrels Swift Observatory Team:

At 07:40:19 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 220302A (trigger=1094950).  Swift did not slew to the burst. 
The BAT on-board calculated location is 
RA, Dec 301.432, +49.389 which is 
   RA(J2000) = 20h 05m 44s
   Dec(J2000) = +49d 23' 20"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a complex
structure with a duration of about 20 sec.  The peak count rate
was ~1156 counts/sec (15-350 keV), at ~2 sec after the trigger. 

Swift is currently restarting after a reaction wheel failure, so
automatic slews to GRBs are turned off.  Therefore there will be
no XRT or UVOT observations at this time. 

Burst Advocate for this burst is E. Troja (nora.gsfc AT gmail.com). 
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/)

V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, 
D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov,  D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile 
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra 
(The Instituto de Astrofisica de Canarias),

D. Buckley 
(South African Astronomical Observatory),

O.A. Gres, N.M. Budnev
(Irkutsk State University, API),

B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez,
M.L.H.Rodriguez (INAOE, OAGH)

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

A. Gabovich, V.Yurkov 
(Blagoveschensk Educational State University)


MASTER-OAGH robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) was pointed to the Swift GRB 220302A ( E. Troja et al., GCN 31661
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 ) errorbox  2514 sec after notice time and 2575 sec after trigger time at 2022-03-02 08:23:15 UT, with upper limit up to  16.6 mag. The observations began at zenith distance = 87 deg. The sun  altitude  is -63.3 deg. 

The galactic latitude b =  9 deg., longitude l = 84 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1899637

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    2606 |         MASTER-OAGH |   C |    60 | 15.8 |        
    2687 |         MASTER-OAGH |   C |    60 | 15.0 |        
    2769 |         MASTER-OAGH |   C |    60 | 15.7 |        
    3051 |         MASTER-OAGH |   C |    60 | 16.6 |        
    3133 |         MASTER-OAGH |   C |    60 | 15.8 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.

E. Troja (NASA/GSFC/UMCP), C. Gronwall (PSU), J. A. Kennea (PSU),
K. L. Page (U Leicester), D. M. Palmer (LANL),
T. M. Parsotan (GSFC/UMBC/CRESSTII) and A. Tohuvavohu (U Toronto)
report on behalf of the Neil Gehrels Swift Observatory Team:

Continuing the recovery from the Reaction Wheel anomaly, Swift has performed a
follow-up observation of GRB 220302A which occurred at 07:40:19 UT (Troja et al., 
GCN 31661
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 ). 

The XRT began observing the field at 16:41:18.7 UT, 32459.3 seconds
after the BAT trigger. Using promptly downlinked data we find an
uncatalogued X-ray source located at RA, Dec 301.43151, 49.38868 which
is equivalent to:
   RA(J2000)  = 20h 05m 43.56s
   Dec(J2000) = +49d 23' 19.2"
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This
location is 1.6 arcseconds from the BAT onboard position, within the
BAT error circle. This position may be improved as more data are
received; the latest position is available at
https://www.swift.ac.uk/sper.  We cannot determine whether the source
is fading at the present time. 

A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 3.44
x 10^21 cm^-2 (Willingale et al. 2013). 

UVOT took a finding chart exposure of 150 seconds with the White filter
starting 32463 seconds after the BAT trigger. No credible afterglow candidate
has been found in the initial data products. The 2.7'x2.7' sub-image covers
100% of the XRT error circle. The typical 3-sigma upper limit has been about
19.6 mag. The 8'x8' region for the list of sources generated on-board covers
100% of the XRT error circle. The list of sources is typically complete to
about 18 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.216. 

Burst Advocate for this burst is E. Troja (nora.gsfc AT gmail.com). 
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/)

J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) 
report on behalf of the Swift-XRT team.

Using 1271 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 220302A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 301.43044, +49.38699 which is equivalent
to:

RA (J2000): 20h 05m 43.30s
Dec (J2000): +49d 23' 13.1"

with an uncertainty of 2.9 arcsec (radius, 90% confidence).

This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).

This circular was automatically generated, and is an official product of the
Swift-XRT team.

Y.-D. Hu, E. Fernandez-Garcia, T.-R. Sun, A. J. Castro-Tirado, M.D. Caballero-Garcia and R. Sanchez-Ramirez (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar and I. Carrasco (UMA), I. H. Park (SKKU) on behalf of a larger collaboration, report:

Following the detection of GRB 220302A by Swift (Troja et al. GCNC 31661), the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) automatically started to observe the GRB localization starting on Mar 2 at 12:59 UT (~5.3 hours after trigger). In the co-added image (5 x 60 s exposures in the clear filter), no optical afterglow is detected within the Swift/XRT error region (Troja et al. GCNC 31664, Osborne et al. GCNC 31666) down to 20.3 mag. This non-detection is consistent with the UVOT (Troja et al. GCNC 31664) and MASTER observation (Lipunov et al. GCNC 31662).

We thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support.

M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. D'Ai
(INAF-IASFPA), J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U.
Toronto), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L.
Page (U. Leicester) and E. Troja report on behalf of the Swift-XRT
team:

We have analysed 3.4 ks of XRT data for GRB 220302A (Troja et al. GCN
Circ. 31661
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 ), from 32.5 ks to 160.8 ks after the  BAT trigger. The data
are entirely in Photon Counting (PC) mode. The enhanced XRT position
for this burst was given by Osborne et al. (GCN Circ. 31666
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 ).

The light curve can be modelled with a power-law decay with a decay
index of alpha=0.7 (+0.5, -0.4).

The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/01094950.

This circular is an official product of the Swift-XRT team.

M. H. Siegel (PSU) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220302A
32464 s after the BAT trigger (Troja et al., GCN Circ. 31661
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 ).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 31666
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 ) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC         32464        32614          147         >19.9
white            32464        32614          147         >19.9
v                32621        33528          885         >19.2
m2               33533        34194          651         >19.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.217 in the direction of the burst
(Schlegel et al. 1998).