Swift Observations of GRB 150323B

J.R. Cummings (CPI) and P. D'Avanzo (INAF-OAB) for the Swift team

1. Introduction

At 09:28:38, Swift-BAT triggered (635929) on GRB 150323B (Cummings GCN Circ. 17619). 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 burst had multiple peaks with a T90 of about 60 seconds. We have event data for only the first peak.

3. XRT Observations and Analysis

XRT results are not available.

4. UVOT Observations and Analysis

UVOT results are not available.

BAT light curve

Figure 1. The BAT mask-weighted light curve in the four individual and total energy bands. The units are counts s-1 illuminated-detector-1.

RA (J2000) Dec (J2000) Error Note Reference
17h21m48.83s +38°19'04.6" 4.3" XRT D'Avanzo et al. GCN Circ. 17657
17h21m47.3s +38°18'59" 1.5' BAT-initial Cummings GCN Circ. 17619

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes
Optical Xin et al. 17638 Xinglong TNT upper limit TNT upper limits
Optical Kelemen 17643 Konkoly optical observations Konkoly
Optical Mazaeva et al. 17649 Khureltogot optical observations Khureltogot
Gamma-ray von Kienlin 17623 Fermi GBM observation Fermi GBM Epeak=99.14 (+4.50/-6.02) keV
T90=54 seconds
Fluence=2.19±0.03x10-5erg cm-2
(88th percentile for long GRBs)
Gamma-ray Golenetskii et al. 17641 Konus-Wind observation Konus-Wind Epeak=109 (-12,+15) keV
Fluence=2.0(-0.1,+0.2)x10-5erg cm-2

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

March 31, 2015