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GRB 191016A: A Long Gamma-Ray Burst Detected by TESS

Journal Article · · The Astrophysical Journal
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Southern Methodist Univ., Dallas, TX (United States)
  2. Australian National Univ., Weston Creek, ACT (Australia)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  6. Boston Univ., MA (United States)
  7. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States)
  8. Univ. of Alabama, Huntsville, AL (United States)
  9. Instituto de Astrofísica de Andalucía (IAA-CSIC), Granada (Spain)
  10. Kanazawa Univ. (Japan)
+ Show Author Affiliations

The Transiting Exoplanet Survey Satellite (TESS) exoplanet-hunting mission detected the rising and decaying optical afterglow of GRB 191016A, a long gamma-ray burst (GRB) detected by Swift-BAT but without prompt XRT or UVOT follow-up due to proximity to the Moon. The afterglow has a late peak at least 1000 s after the BAT trigger, with a brightest-detected TESS data point at 2589.7 s post-trigger. The burst was not detected by Fermi-LAT, but was detected by Fermi-GBM without triggering, possibly due to the gradual nature of the rising light curve. Using ground-based photometry, we estimate a photometric redshift of zphot = 3.29 ± 0.40. Combined with the high-energy emission and optical peak time derived from TESS, estimates of the bulk Lorentz factor ΓBL range from 90 to 133. The burst is relatively bright, with a peak optical magnitude in ground-based follow-up of R = 15.1 mag. Using published distributions of GRB afterglows and considering the TESS sensitivity and sampling, we estimate that TESS is likely to detect ~1 GRB afterglow per year above its magnitude limit.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1781058
Alternate ID(s):
OSTI ID: 23163437
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 911; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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79 ASTRONOMY AND ASTROPHYSICS