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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

14950 results found.

  1. GRB 190914A: Fermi GBM Final Real-time Localization
  2. Correction in name: GRB 190828C (not GRB 190928C) : AstroSat CZTI detection
  3. GRB 190828C: AstroSat CZTI detection
  4. LIGO/Virgo S190910d: MASTER previous detection of Gaia19eba/AT2019qam
  5. GRB 190913A: Fermi GBM Final Real-time Localization
  6. LIGO/Virgo S190910h: AT2019pxi, AT2019pxj and AT2019pxn 10.4m GTC spectroscopy
  7. LIGO/Virgo S190910h: Four additional candidates from the Zwicky Transient Facility
  8. LIGO/Virgo S190910d: AT2019pvu, AT2019pvv, AT2019pvz and AT2019pwa 10.4m GTC spectroscopy
  9. LIGO/Virgo S190910h: No counterpart candidates in HAWC observations
  10. LIGO/Virgo S190910h: Upper limits from Fermi-GBM Observations
  11. LIGO/Virgo S190910d: Candidates from the Zwicky Transient Facility
  12. LIGO/Virgo S190910d: Upper limits from Fermi-GBM Observations
  13. ZTF19abvizsw: No counterpart candidates from Swift/BAT targeted search
  14. LIGO/Virgo S190910d: No counterpart candidates in HAWC observations
  15. GRB 190910A: Fermi GBM Final Real-time Localization
  16. GRB 190901A: AstroSat CZTI detection
  17. ZTF19abvizsw/AT2019pim, search for GRB in SPI-ACS/INTEGRAL data
  18. GRB 190823A: Swift-XRT afterglow detection
  19. GRB 190906B: Fermi GBM Final Real-time Localization
  20. GRB 190829A: ATCA cm-band detection
  21. LIGO/Virgo S190901ap: Second Epoch Hobby-Eberly Telescope observations of ZTF19abvionh
  22. GRB 190905A: Fermi GBM Final Real-time Localization
  23. IPN triangulation of GRB 190903A (short)
  24. LIGO/Virgo S190901ap : GRAWITA spectroscopic observation of candidate MASTER OT J171434.95+280725.6
  25. Konus-Wind observation of GRB 190829A
  26. LIGO/Virgo S190901ap: Dabancheng-0.5m optical observations of AT2019pjv
  27. Swift XRT Detection of X-ray Emission from ZTF19abvizsw
  28. LIGO/Virgo S190901ap: GOTO optical coverage and detection of AT2019pjv
  29. GRB190829A: GROND detection of the accompanying SN
  30. LIGO/Virgo S190901ap: MASTER OT J171434.95+280725.6/AT2019pjv detection
  31. GRB 190901A: Insight-HXMT/HE detection
  32. LIGO/Virgo S190901ap: Upper limits from Insight-HXMT/HE observations
  33. Liverpool Telescope observations of ZTF19abvizsw, a candidate untriggered GRB afterglow
  34. GRB 190904A: Fermi GBM Final Real-time Localization
  35. GRB 190829A: LCO Optical Afterglow Detection
  36. GRB 190903A: Fermi GBM detection
  37. GRB 190903A: Fermi GBM Final Real-time Localization
  38. GRB 190829A: Detection of radio afterglow with the uGMRT
  39. GRB 190831B: CALET Gamma-Ray Burst Monitor detection of a short burst
  40. LIGO/Virgo S190901ap: Upper limits from Fermi-GBM Observations
  41. LIGO/Virgo S190901ap: No counterpart candidates in HAWC observations
  42. GRB 190901A: Fermi GBM Final Real-time Localization
  43. GRB 190829A: NOEMA detection of the mm afterglow
  44. LIGO/Virgo S190814bv: AT2019odc and AT2019omt 10.4m GTC spectroscopy
  45. GRB 190831A: Fermi GBM Final Real-time Localization
  46. GRB 190829A: UKIRT detection of the NIR Afterglow
  47. GRB 190829A: MMT detection of the optical afterglow
  48. GRB 190829A: No Neutrino Counterpart detected with ANTARES
  49. GRB 190829A: KAIT Detection of the Optical Afterglow
  50. GRB 190829A: AGILE ratemeters detection and MCAL upper limits
  51. GRB 190828D: Insight-HXMT/HE detection
  52. GRB 190829A: Fermi GBM detection
  53. GRB 190829A:: Global MASTER-net optical clear and polarization observations scheduler and some spiculations
  54. LIGO/Virgo S190814bv: AT2019nqc and AT2019nqz 10.4m GTC spectroscopy
  55. GRB 190829A: Swift/UVOT detection of an optical afterglow with a rise
  56. GRB 190829A: GROND detection of the Optical/NIR Afterglow
  57. GRB190829A: Detection of VHE gamma-ray emission with H.E.S.S.
  58. GRB 190829A: 10.4m GTC spectroscopy
  59. GRB 190830B: Fermi GBM Final Real-time Localization
  60. GRB 190829A: NOT optical afterglow detection and spectroscopy
  61. GRB 190830A: Fermi GBM Final Real-time Localization
  62. GRB 190829A: GROWTH India detection of afterglow
  63. GRB 190829A:: MASTER-net bright and decay OT detection
  64. GRB 190829A: Dabancheng-0.5m optical afterglow detection
  65. GRB 190829A: Swift detection of a burst consistent with a galaxy at z=0.08
  66. GRB 190829A: Fermi GBM Final Real-time Localization
  67. LIGO/Virgo S190426c: Update on Probability of Terrestrial Origin
  68. LIGO/Virgo S190828l: Upper limits from Insight-HXMT/HE observations
  69. LIGO/Virgo S190814bv: AT2019nxe and AT2019obc 10.4m GTC spectroscopy
  70. GRB 190823A: AstroSat CZTI detection
  71. LIGO/Virgo S190814bv: no variation of DESGW candidates AT 2019onj and AT 2019okr from ENGRAVE VLT/HAWK-I observations, and archival detection
  72. LIGO/Virgo S190828l: Upper limits from Fermi-GBM Observations
  73. LIGO/Virgo S190828j: Upper limits from Fermi-GBM Observations
  74. GRB 190828C: Fermi GBM Final Real-time Localization
  75. GRB 190828B: Swift detection of a burst
  76. GRB 190828B: Fermi GBM Final Real-time Localization
  77. GRB 190828A: MAXI/GSC detection
  78. LIGO/Virgo S190828l: No counterpart candidates in HAWC observations
  79. LIGO/Virgo S190828j: No counterpart candidates in HAWC observations
  80. LIGO/Virgo S190814bv: DESGW non-detection of AT2019osy/ASKAP 005547-270433
  81. LIGO/Virgo S190814bv: Optical non-detection of radio source AT2019osy from CFHT
  82. Fermi GBM-190816: Eight additional candidates from the Zwicky Transient Facility
  83. GRB 190827A: Fermi GBM Final Real-time Localization
  84. LIGO/Virgo S190814bv: DECam-GROWTH detection of an optical counterpart to the radio source AT2019osy
  85. LIGO/Virgo S190814bv: Detection of a candidate radio counterpart with ASKAP
  86. LIGO/Virgo S190814bv: Final list of candidates from the DESGW coadd analysis from the week long search campaign
  87. LIGO/Virgo S190814bv: CFHTphotometryof AT2019npv
  88. LIGO/Virgo S190814bv : Magellan IMACS Spectrum of AT2019npv classified as a Type Ib supernova
  89. LIGO/Virgo S190814bv: Radio non-detection of DG19wxnjc/AT2019npv with the VLA
  90. LIGO/Virgo S190814bv: Keck II NIRES classification of DG19wxnjc/AT2019npv as a stripped envelope supernova
  91. LIGO/Virgo S190814bv: LCO Photometry of DG19wxnjc/AT2019npv
  92. GRB 190816A: Swift-XRT afterglow detection
  93. LIGO/Virgo S190814bv: No radio counterpart to DG19wxnjc/AT2019npv in ASKAP observations
  94. GRB 190825A: Fermi GBM Final Real-time Localization
  95. LIGO/Virgo S190814bv: Archival detection of DG19wxnjc/AT2019npv in DES data
  96. GRB 190824A: Swift detection of a burst
  97. GRB 190824A: Fermi GBM Final Real-time Localization
  98. LIGO/Virgo S190814bv: GROND follow-up observations of AT2019npv
  99. GRB 190823A: MAXI/GSC detection
  100. LIGO/Virgo S190814bv: Further Pan-STARRS z-band observations and AT2019npv photometry

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