Swift Observations of GRB 150402A

J.R. Cummings (CPI) and M. De Pasquale (INAF-IASF Palermo) for the Swift team

1. Introduction

At 00:37:46 Swift-BAT triggered on GRB 150402A (trigger# 636865) (Cummings and Palmer GCN Circ. 17661). Table 1 contains the best reported positions from Swift.

Table 2 is a summary of GCN Circulars about this GRB from observatories other than Swift.

Standard analysis products for this burst are available at http://gcn.gsfc.nasa.gov/swift_gnd_ana.html.

2. BAT Observations and Analysis

The lightcurve (Figure 1) shows two symmetrical peaks, each about 5 seconds long, the second harder and brighter. The counting rate in BAT of the brighter peak was about 1500 counts s^-1. T₉₀ was about 14 ± 2 seconds.

3. XRT Observations and Analysis

XRT results are not available.

4. UVOT Observations and Analysis

UVOT results are not available.

Figure 1. The BAT light curve is not available.

RA (J2000) Dec (J2000) Error Note Reference

11^h34^m21.16^s +40°56'25.8" 4.8" XRT-final UKSSDC

11^h34^m37.9^s +40°59'33" 2.5' BAT-initial Cummings and Palmer GCN Circ. 17661

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes

Optical Littlejohns et al. 17663 RATIR Optical Observations RATIR detection

Table 2. Summary of GCN Circulars from other observatories sorted by band and then circular number.

RA (J2000)	Dec (J2000)	Error	Note	Reference
11^h34^m21.16^s	+40°56'25.8"	4.8"	XRT-final	UKSSDC
11^h34^m37.9^s	+40°59'33"	2.5'	BAT-initial	Cummings and Palmer GCN Circ. 17661

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Optical	Littlejohns et al.	17663	RATIR Optical Observations	RATIR	detection

April 11, 2015