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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"

5188 results found.

  1. GRB 160225B: Fermi GBM detection
  2. IPN Triangulation of GRB 160225B
  3. GRB 160225A: MASTER-Amur observations
  4. GRB 160225A: Xinglong TNT optical observation
  5. GRB 160225A: Swift-XRT refined Analysis
  6. GRB 160225A: MITSuME Akeno Optical Observation
  7. GRB 160225A: MASTER-Amur early observations
  8. GRB 160223B: MASTER-Amur early observations
  9. GRB 160223B: Khureltogot optical observations
  10. GRB 160220B: Further GROND Observations
  11. GRB 160220A: Swift-XRT refined Analysis
  12. GRB 160220B: Swift-XRT refined Analysis
  13. GRB 160216A: Swift-XRT refined Analysis
  14. LIGO/Virgo G184098: Correction for GCN Circular 18361
  15. GRB 160206B: Fermi GBM detection
  16. LIGO/Virgo G211117: LOFAR follow-up
  17. GRB 160203A: Skynet PROMPT-CTIO observations of the optical afterglow
  18. GRB 160203A: Swift-XRT refined Analysis
  19. GRB 160203A: GROND Afterglow Candidate
  20. GRB 160131A: Swift-XRT refined Analysis
  21. GRB 160127A: Swift-XRT refined Analysis
  22. GRB 160123A: Swift-XRT refined Analysis
  23. GRB 160121A: Swift-XRT refined Analysis
  24. GRB 160121A: Swift detection of a burst
  25. GRB 160119A: Swift-XRT refined Analysis
  26. GRB 160117B: GROND optical/NIR afterglow observations
  27. GRB 160117B: Swift-XRT refined Analysis
  28. Konus-Wind observation of GRB 151229B
  29. IPN Triangulation of GRB 151229B (extremely intense/long)
  30. GRB 160104A: Continued MITSuME Akeno Optical Observation
  31. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  32. GRB 160107A: MAXI/GSC detection
  33. GRB 160104A: Swift-XRT refined Analysis
  34. GRB 160104A: Fermi GBM observation
  35. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  36. GRB 160104A: MASTER early OT detection
  37. GRB 160104B: MAXI/GSC detection
  38. GRB 160104A: MITSuME Akeno Optical Observation
  39. GRB 160104A: Swift detection of a burst
  40. LIGO/Virgo G211117: LOFAR follow-up
  41. LIGO/Virgo G211117: CSS/CRTS observations on 29/30 Dec 2015 UT
  42. GRB 160101A: MAXI/GSC detection
  43. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  44. IPN Triangulation of GRB 151227B
  45. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  46. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  47. GRB 151229A Swift-BAT Spectral lag analysis
  48. GRB 151229A: Swift-XRT refined Analysis
  49. GRB 151228B: Swift-XRT refined Analysis
  50. LIGO/Virgo G211117: Further Swift-XRT sources
  51. LIGO/Virgo G211117: Swift-XRT sources
  52. Fermi GBM trigger 472694170/151224997 is not a GRB
  53. V404Cyg Swift Trigger 668097:
  54. GRB 151216A: MAXI/GSC detection
  55. GRB 151215A: Swift-XRT refined Analysis
  56. GRB151215A: P60 Optical Afterglow Candidate
  57. GRB 151210A: Swift-XRT refined Analysis
  58. Swift detection of 4U 1850-03
  59. GRB 130831A: MASTER early OT detection and LC
  60. GRB 151205A: Swift-XRT refined Analysis
  61. GRB 151205C: MAXI/GSC detection
  62. GRB 151205A: Garching Telescope Upper Limit
  63. GRB 151127A: Swift-XRT refined Analysis
  64. GRB 151120A: Swift-XRT afterglow detection
  65. GRB 151118A: Swift-XRT refined Analysis
  66. GRB GRB 151118A: MASTER-NET optical observations
  67. GRB 151114A: Swift-XRT refined Analysis
  68. GRB 151107B: CALET Gamma-Ray Burst Monitor detection
  69. GRB 151112A: GROND photometric redshift and i'-band prediction
  70. GRB 151112A: MAXI/GSC detection
  71. GRB 151112A: Swift-XRT refined Analysis
  72. GRB 151111A: Swift-XRT refined Analysis
  73. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  74. GRB 151107B
  75. LIGO/Virgo G194575: MAXI/GSC further analysis
  76. GRB 151031A: Swift-XRT refined Analysis
  77. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  78. GRB 151029A: Swift-XRT refined Analysis
  79. GRB 151029A: LCOGT-FTS afterglow observations
  80. GRB 151027B: Swift-XRT refined Analysis
  81. GRB 151027B: GROND Optical/NIR Afterglow Detection
  82. LIGO/Virgo G194575 : RATIR Observation of La Silla - QUEST Candidate
  83. GRB 151027A: MITSuME Akeno Optical observation
  84. GRB 151027A: Swift-XRT refined Analysis
  85. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  86. LIGO/Virgo G194575: INAF-TNG follow-up of LSQ15bjb
  87. LIGO/Virgo G194575 : La Silla - QUEST followup
  88. LIGO/Virgo G194575: Near-infrared follow-up with OAO-WFC
  89. LIGO/Virgo G194575: Kanata/J-GEM optical follow-up
  90. GRB 151023A: Swift-XRT refined Analysis
  91. LIGO/Virgo G194575: CQUEAN/LOAO observations
  92. GRB 151022A: Swift-XRT refined Analysis
  93. LIGO/Virgo G194575: Mini-MegaTORTORA observations
  94. GRB 151021A: Swift-XRT refined Analysis
  95. GRB 151006A: MITSuME Akeno optical upper limits
  96. GRB 151006A: Swift-XRT refined Analysis
  97. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  98. Swift Trigger 657564: MASTER-NET early optical observations.
  99. GRB 151001B: Swift-XRT refined Analysis
  100. GRB 151001A: NOT imaging

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