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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"

12185 results found.

  1. GRB 160119A: NOT and GTC afterglow candidate
  2. GRB 160119A: Swift detection of a burst
  3. GRB 160117B: Swift-XRT refined Analysis
  4. GRB 160117B: LCOGT-SSO optical observations
  5. Konus-Wind observation of GRB 160113A
  6. GRB 160117B: Swift detection of a burst with optical counterpart
  7. GRB 160106A: CALET Gamma-Ray Burst Monitor detection
  8. Konus-Wind observation of GRB 160104B
  9. Konus-Wind observation of GRB 160102A
  10. Konus-Wind observation of GRB 151231A
  11. Konus-Wind observation of GRB 160111A
  12. GRB 160113A: Fermi GBM detection
  13. Konus-Wind observation of GRB 160107A
  14. IPN Triangulation of GRB 151231A
  15. Konus-Wind observation of GRB 151229B
  16. GRB 160107A: CALET Gamma-Ray Burst Monitor detection
  17. GRB 160107A: Fermi GBM observation
  18. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  19. GRB 160107A: MAXI/GSC detection
  20. Konus-Wind observation of GRB 160101A
  21. Konus-Wind observation of GRB 151225A
  22. GRB 160104A: Spectroscopic observations from 10.4m GTC
  23. GRB 160104A: Swift-BAT refined analysis
  24. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  25. GRB 160104A: MASTER early OT detection
  26. GRB 160104B: MAXI/GSC detection
  27. GRB 160104A: Swift detection of a burst
  28. LIGO/Virgo G211117: Fermi/LAT observations
  29. LIGO/Virgo G211117: Gemini classification of 7 Pan-STARRS transients
  30. LIGO/Virgo G211117: Liverpool Telescope classification of EM candidates
  31. GRB 160101A: MITSuME Akeno optical upper limits
  32. GRB 160102A: MAXI/GSC detection
  33. GRB 160101B: Fermi-LAT detection
  34. GRB 160101A: Swift-XRT afterglow detection
  35. GRB 160101A: MAXI/GSC detection
  36. GRB 151227B: CALET Gamma-Ray Burst Monitor detection
  37. LIGO/Virgo G211117: Liverpool Telescope classification of EM candidates
  38. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  39. LIGO/Virgo G211117: Liverpool Telescope followup of EM candidates
  40. Konus-Wind observation of GRB 151227B
  41. LIGO/Virgo G211117: OAO-WFC NIR follow-up observations
  42. LIGO/Virgo G211117: SkyMapper observations and transient candidate
  43. LIGO/Virgo G211117: MASTER Observations of the 3 iPTF candidates
  44. GRB 151229A: MITSuME Akeno optical upper limits
  45. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  46. LIGO/Virgo G211117: List of near-term future observation regions by Project Mini-GWAC of SVOM
  47. LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28, 29
  48. GRB 151229A: Swift-XRT refined Analysis
  49. GRB 151228B: Swift-XRT refined Analysis
  50. LIGO/Virgo G211117: Further Swift-XRT sources
  51. GRB 151228A: MITSuME Akeno optical upper limits
  52. GRB 151228A: T60 observations
  53. GRB 151229A: Swift detection of a short burst
  54. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  55. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  56. GRB 151228B: Swift detection of a burst with an optical detection
  57. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  58. LIGO/Virgo G211117: INTEGRAL was inactive at the time of the event
  59. LIGO/Virgo G211117: Pan-STARRS1 observations 2015-12-28
  60. GRB 151212A iTelescope observation
  61. Konus-Wind observation of GRB 151222A
  62. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  63. V404Cyg Swift Trigger 668097:
  64. Fermi GBM trigger 472271765/151220108 is not a GRB
  65. IBAS Alert 7313 is SGR J1935+2154
  66. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  67. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  68. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  69. GRB 151216A: MAXI/GSC detection
  70. GRB 151210B: CALET Gamma-Ray Burst Monitor detection
  71. GRB 151212A: MAXI/GSC detection
  72. GRB 151210A: GROND Afterglow Confirmation
  73. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  74. GRB 151205C: Optical follow-up observations at Kiso
  75. GRB 151205A: Khureltogot upper limit
  76. GRB 130831A: MASTER early OT detection and LC
  77. GRB 151205A: Swift-XRT refined Analysis
  78. GRB 151205C: MAXI/GSC detection
  79. GRB 151205B: MASTER-NET early optical observations
  80. GRB 151205A: Swift detection of a burst
  81. GRB 151127A iTelescope observation
  82. GRB 151127A: LCOGT-SSO optical upper limits
  83. GRB 151118A iTelescope observation
  84. Konus-Wind observation of GRB 151120A
  85. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  86. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  87. GRB 151120A: Swift-XRT afterglow detection
  88. GRB 151120A: Fermi GBM observation
  89. GRB 151120A: GROND optical/NIR afterglow
  90. GRB 151120A: A long GRB detected by INTEGRAL
  91. 610 MHz detection of GRB 151027A with the GMRT
  92. GRB GRB 151118A: MASTER-NET optical observations
  93. GRB151027A; Optical observations
  94. GMRT radio detection of GRB 151027A
  95. GRB 151107B: CALET Gamma-Ray Burst Monitor detection
  96. GRB 151114A: Swift detection of a burst with an optical counterpart
  97. GRB 151112A: MAXI/GSC detection
  98. GRB 151112A: Swift-XRT refined Analysis
  99. GRB 151112A: Swift-BAT refined analysis
  100. GRB 151112A: Swift-XRT observations

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