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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"

28293 results found.

  1. GRB 160506A: Swift detection of a burst
  2. GRB 160504A: Swift-BAT refined analysis
  3. GRB 160504A: RATIR Optical and NIR Observations
  4. GRB 160504A: Swift/UVOT Upper Limits
  5. GRB 160504A: Bassano Bresciano Observatory upper limits
  6. GRB 160504A: Swift-XRT refined Analysis
  7. GRB 160504A: Enhanced Swift-XRT position
  8. GRB 160504A: NOT upper limits
  9. GRB 160417A, the review of the sky area in plate archive
  10. GRB 160504A: TAROT Calern observatory optical observations
  11. GRB 160504A: Swift detection of a burst
  12. ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
  13. GRB 160503A: Fermi GBM observation
  14. VERITAS rapid follow-up observations of IceCube event 160427A
  15. GRB 160501A: Swift-BAT refined analysis
  16. GRB 160501A: GROND Upper limits
  17. GRB 160501A: MITSuME Okayama upper limits
  18. GRB 160501A: UKIRT near-IR upper limits
  19. GRB 160501A: Swift/UVOT Upper Limits
  20. GRB 160501A: Swift-XRT refined Analysis
  21. GRB 160501A: RATIR Optical and NIR Observations
  22. GRB 160501A: Enhanced Swift-XRT position
  23. GRB 160501A: TAROT Calern observatory optical observations
  24. GRB 160501A: NOT optical and NIR observations
  25. GRB 160501A: Swift detection of a burst
  26. Archival observations by HAWC of IceCube HESE event of April 27, 2016
  27. Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
  28. GRB 160422A: XRT Afterglow Confirmation
  29. LSGT observation of GRB 160425A
  30. GRB 160425A: Swift/UVOT Detection
  31. GRB 160425A: Skynet PROMPT-CTIO observations of the optical afterglow
  32. GRB 160425A: Swift-BAT refined analysis
  33. GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow
  34. GRB 160422A: GROND NIR afterglow detection
  35. GRB 160425A MASTER notices: possible host galaxy in the optical error-box
  36. GRB 160425A: GROND observation
  37. GRB 160425A: Swift-XRT refined Analysis
  38. GRB 160425A: Enhanced Swift-XRT position
  39. GRB 160422A: Swift/UVOT Afterglow Confirmation
  40. GRB 160422A: CALET Gamma-Ray Burst Monitor detection
  41. GRB 160425A: Swift detection of an unusual burst with an optical afterglow
  42. LIGO/Virgo G197392 / LVT151012: Identification of a GW CBC Candidate
  43. GRB 160424A: Swift-BAT refined analysis
  44. GRB 160424A: Swift-XRT observations
  45. GRB 160422A: Swift-XRT afterglow detection
  46. GRB 160422A: Swift/UVOT Candidate Afterglow
  47. GRB 160422A: Fermi GBM observation
  48. GRB 160422A: Fermi-LAT Detection
  49. GRB 160419A, Swift-BAT refined analysis
  50. GRB 160417A: GMG observations
  51. GRB 160417A: Swift-BAT refined analysis
  52. GRB 160417A: Swift/UVOT Detection
  53. GRB 160417A: Swift-XRT refined Analysis
  54. GRB 160417A: MITSuME Okayama upper limits
  55. GRB 160417A: Enhanced Swift-XRT position
  56. GRB 160417A: Swift detection of a burst with an optical counterpart
  57. LIGO/Virgo G211117: EWE for NOWT of 12 days follow-up of northern sky
  58. GRB 160412A: GROND upper limits
  59. Konus-Wind observation of GRB 160409A
  60. GRB 160410A: TLS Tautenburg observations
  61. GRB 160412A: Swift/UVOT Upper Limits
  62. GRB 160409A: Swift-XRT observations
  63. GRB 160409A found in Swift BAT ground analysis
  64. GRB 160412A: Swift-XRT refined Analysis
  65. GRB 160411A: Swift-BAT refined analysis of the short burst
  66. GRB 160412A: Swift-BAT refined analysis
  67. GRB 160412A: Enhanced Swift-XRT position
  68. GRB 160412A: Swift detection of a burst
  69. GRB 160408A: 6.0 GHz VLA upper limit
  70. GRB 160411A: GROND Optical/NIR upper limits
  71. GRB 160411A: Swift/UVOT Upper Limits
  72. GRB 160410A: UKIRT near-IR upper limits
  73. Konus-Wind observation of GRB 160410A (short/hard)
  74. GRB 160410A: TAROT La Silla observatory early optical observations
  75. GRB 160411A: Swift-XRT refined Analysis
  76. GRB 160411A: Enhanced Swift-XRT position
  77. GRB 160410A: Swift-XRT refined Analysis
  78. GRB 160411A: Swift-XRT observations
  79. GRB 160410A: GMG observation
  80. GRB 160410A: Skynet PROMPT-CTIO observations of the optical afterglow
  81. GRB 160410A: Swift-BAT refined analysis of the short GRB
  82. GRB 160410A: Swift/UVOT Detection
  83. GRB 160410A: Enhanced Swift-XRT position
  84. GRB 160410A: GROND optical detection
  85. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  86. GRB 160408A: GMG observation limit
  87. GRB 160408A: TLS Tautenburg observations
  88. GRB 160408A: Swift/UVOT Upper Limits
  89. GRB 160408A: Swift-XRT refined Analysis
  90. GRB 160406A: Fermi GBM observation
  91. GRB 160408A: Swift-BAT refined analysis
  92. GRB 160408A: Gemini optical observations
  93. GRB 160408A: Enhanced Swift-XRT position
  94. GRB 160408A: Swift detection of a short burst
  95. IPN Triangulation of GRB 160406A (short/hard)
  96. GRB 160401A: Swift-XRT observations
  97. GRB 160401A: Swift/UVOT Upper Limits
  98. GRB 160401A: Zadko observatory - Gingin optical observations
  99. GRB 160401A: LT observations
  100. GRB 160401A: a long GRB detected by INTEGRAL

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