GRB 241101A

V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(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. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),

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

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

MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 241101A ( T. M. Parsotan et al., GCN 38025
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 ) errorbox  66958 sec after notice time and 66984 sec after trigger time at 2024-11-02 00:18:10 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 87 deg. The sun  altitude  is -38.2 deg. 

The galactic latitude b = 79 deg., longitude l = 40 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2655501

We obtain a following upper limits.  

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

   67075 |   MASTER-Kislovodsk |   C |   180 | 16.2 |        
   68322 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   69560 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   70917 |   MASTER-Kislovodsk |   C |   180 | 17.8 |        
   72195 |   MASTER-Kislovodsk |   C |   180 | 18.0 |        
   73394 |   MASTER-Kislovodsk |   C |   180 | 17.9 |        
   74716 |   MASTER-Kislovodsk |   C |   180 | 17.8 |        
Filter C is a clear (unfiltred) band. 


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

Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ),
Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek,
Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza
(Institute of Physics, Prague, CZ)

report:

The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the Swift/BAT alert of GRB241101A (Parsotan et al., GCNC 38025, Lien et al., GCNC 38033), obtaining a series of unfiltered images starting at 05:42:20.6 UT, i.e. 35s post trigger.

The observation sequence consisted of 40x20s exposures followed by 30x60s exposures, covering a field of view of 30 arcmin centered on the BAT position. We do not detect any new or strongly variable source in single or combined images. A deep combined image of all data taken during the first hour of follow-up (characteristic time T0+1.4ks), calibrated against Gaia DR3, reaches a 3-sigma limiting magnitude of G > 20.2 (AB).

A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC), R. Gupta (GSFC),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),
C. B. Markwardt (GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL),
T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU)
(i.e. the Swift-BAT team):
 
Using the data set from T-60 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 241101A (trigger #1264304)
(Parsotan, et al., GCN Circ. 38025
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 ).  The BAT ground-calculated position is
RA, Dec = 204.323, 28.233 deg which is
   RA(J2000)  =  13h 37m 17.5s
   Dec(J2000) = +28d 13' 57.6"
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
 
The mask-weighted light curve shows a single-pulse structure that starts at
T-2 sec, peaks at T+1 sec, and ends at T+9 sec.  T90 (15-350 keV) is
10.3 +- 4.5 sec (estimated error including systematics).
 
The time-averaged spectrum from T-2.76 to T+12.86 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.79 +- 0.13.  The fluence in the 15-150 keV band is 5.1 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.29 sec in the 15-150 keV band
is 1.4 +- 0.1 ph/cm2/sec.  All the quoted errors are at the 90% confidence
level.
 
The results of the batgrbproduct analysis are available at
https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1264304 

T. M. Parsotan (GSFC), S. Dichiara (PSU), R. Gupta (NASA GSFC),
T. Sakamoto (AGU) and T. Sbarrato (INAF-OAB) report on behalf of the
Neil Gehrels Swift Observatory Team:

At 05:41:45 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 241101A (trigger=1264304).  The BAT on-board calculated location is 
RA, Dec 204.333, +28.264 which is 

  RA(J2000)  = 13h 37m 20s
  Dec(J2000) = +28d 15' 49"

with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a double-peaked 
structure with a duration of about 15 sec.  The peak count rate
was ~2300 counts/sec (15-350 keV), at ~1 sec after the trigger.

Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 17:57 UT on 2024 November 05. There will thus be no XRT
or UVOT data for this trigger before this time.

Burst Advocate for this burst is T. M. Parsotan (tyler.parsotan AT nasa.gov).
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/)