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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.

Advanced Search Examples (click to copy):

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

28272 results found.

  1. GRB 160501A: Enhanced Swift-XRT position
  2. GRB 160501A: TAROT Calern observatory optical observations
  3. GRB 160501A: NOT optical and NIR observations
  4. GRB 160501A: Swift detection of a burst
  5. Archival observations by HAWC of IceCube HESE event of April 27, 2016
  6. Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
  7. GRB 160422A: XRT Afterglow Confirmation
  8. LSGT observation of GRB 160425A
  9. GRB 160425A: Swift/UVOT Detection
  10. GRB 160425A: Skynet PROMPT-CTIO observations of the optical afterglow
  11. GRB 160425A: Swift-BAT refined analysis
  12. GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow
  13. GRB 160422A: GROND NIR afterglow detection
  14. GRB 160425A MASTER notices: possible host galaxy in the optical error-box
  15. GRB 160425A: GROND observation
  16. GRB 160425A: Swift-XRT refined Analysis
  17. GRB 160425A: Enhanced Swift-XRT position
  18. GRB 160422A: Swift/UVOT Afterglow Confirmation
  19. GRB 160422A: CALET Gamma-Ray Burst Monitor detection
  20. GRB 160425A: Swift detection of an unusual burst with an optical afterglow
  21. LIGO/Virgo G197392 / LVT151012: Identification of a GW CBC Candidate
  22. GRB 160424A: Swift-BAT refined analysis
  23. GRB 160424A: Swift-XRT observations
  24. GRB 160422A: Swift-XRT afterglow detection
  25. GRB 160422A: Swift/UVOT Candidate Afterglow
  26. GRB 160422A: Fermi GBM observation
  27. GRB 160422A: Fermi-LAT Detection
  28. GRB 160419A, Swift-BAT refined analysis
  29. GRB 160417A: GMG observations
  30. GRB 160417A: Swift-BAT refined analysis
  31. GRB 160417A: Swift/UVOT Detection
  32. GRB 160417A: Swift-XRT refined Analysis
  33. GRB 160417A: MITSuME Okayama upper limits
  34. GRB 160417A: Enhanced Swift-XRT position
  35. GRB 160417A: Swift detection of a burst with an optical counterpart
  36. LIGO/Virgo G211117: EWE for NOWT of 12 days follow-up of northern sky
  37. GRB 160412A: GROND upper limits
  38. Konus-Wind observation of GRB 160409A
  39. GRB 160410A: TLS Tautenburg observations
  40. GRB 160412A: Swift/UVOT Upper Limits
  41. GRB 160409A: Swift-XRT observations
  42. GRB 160409A found in Swift BAT ground analysis
  43. GRB 160412A: Swift-XRT refined Analysis
  44. GRB 160411A: Swift-BAT refined analysis of the short burst
  45. GRB 160412A: Swift-BAT refined analysis
  46. GRB 160412A: Enhanced Swift-XRT position
  47. GRB 160412A: Swift detection of a burst
  48. GRB 160408A: 6.0 GHz VLA upper limit
  49. GRB 160411A: GROND Optical/NIR upper limits
  50. GRB 160411A: Swift/UVOT Upper Limits
  51. GRB 160410A: UKIRT near-IR upper limits
  52. Konus-Wind observation of GRB 160410A (short/hard)
  53. GRB 160410A: TAROT La Silla observatory early optical observations
  54. GRB 160411A: Swift-XRT refined Analysis
  55. GRB 160411A: Enhanced Swift-XRT position
  56. GRB 160410A: Swift-XRT refined Analysis
  57. GRB 160411A: Swift-XRT observations
  58. GRB 160410A: GMG observation
  59. GRB 160410A: Skynet PROMPT-CTIO observations of the optical afterglow
  60. GRB 160410A: Swift-BAT refined analysis of the short GRB
  61. GRB 160410A: Swift/UVOT Detection
  62. GRB 160410A: Enhanced Swift-XRT position
  63. GRB 160410A: GROND optical detection
  64. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  65. GRB 160408A: GMG observation limit
  66. GRB 160408A: TLS Tautenburg observations
  67. GRB 160408A: Swift/UVOT Upper Limits
  68. GRB 160408A: Swift-XRT refined Analysis
  69. GRB 160406A: Fermi GBM observation
  70. GRB 160408A: Swift-BAT refined analysis
  71. GRB 160408A: Gemini optical observations
  72. GRB 160408A: Enhanced Swift-XRT position
  73. GRB 160408A: Swift detection of a short burst
  74. IPN Triangulation of GRB 160406A (short/hard)
  75. GRB 160401A: Swift-XRT observations
  76. GRB 160401A: Swift/UVOT Upper Limits
  77. GRB 160401A: Zadko observatory - Gingin optical observations
  78. GRB 160401A: LT observations
  79. GRB 160401A: a long GRB detected by INTEGRAL
  80. GRB 160327A: Continued RATIR Optical and NIR Observations
  81. LIGO/Virgo G211117: LOFAR follow-up
  82. GRB 160327A: Imaging and spectroscopy from GTC
  83. GRB 160327A: Continued RATIR Optical and NIR Observations
  84. GRB 160327A: Mondy optical upper limit
  85. GRB 160327A: Swift-BAT refined analysis
  86. GRB 160327A: Swift/UVOT Upper Limits
  87. GRB 160327A: Swift-XRT refined Analysis
  88. GRB 160327A: Enhanced Swift-XRT position
  89. GRB 160327A: RATIR Optical and NIR Afterglow Detection
  90. GRB 160327A: Swift detection of a burst
  91. GRB 160325A, Swift-BAT refined analysis
  92. GRB 160325A: GROND Upper Limits
  93. GRB 160325A: Swift-XRT refined Analysis
  94. GRB 160325A: afterglow confirmation
  95. GRB 160325A: Enhanced Swift-XRT position
  96. Swift Trigger 680457 is not a GRB
  97. LIGO/Virgo G211117: CALET GBM Observations
  98. GRB160325A: REM NIR observations
  99. GRB 160325A: Swift detection of a burst
  100. Swift detects GX 301-2 in very high state

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