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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"

37674 results found.

  1. GRB 151228B: AbAO optical upper limit
  2. GRB 160104A: ISON-Ussuriysk optical observations
  3. GRB 160117A: Swift-XRT observations
  4. GRB 160117B: GROND optical/NIR afterglow observations
  5. GRB 160117B: VLT/X-shooter spectroscopy
  6. GRB 160117B: iTelescope T17 optical observations
  7. GRB 160117B: NOT optical afterglow observations
  8. GRB 160117B: Swift-XRT refined Analysis
  9. GRB 160117A: Swift-BAT refined analysis
  10. GRB 160117B: Swift/UVOT Detection
  11. GRB 160117B: Enhanced Swift-XRT position
  12. GRB 160117B: LCOGT-SSO optical observations
  13. GRB 160117B: MASTER-Amur OT observations
  14. Konus-Wind observation of GRB 160113A
  15. GRB 160117B: Swift detection of a burst with optical counterpart
  16. GRB 160117A: Swift detection of a burst
  17. GRB 160106A: CALET Gamma-Ray Burst Monitor detection
  18. IPN Triangulation of GRB 160113A
  19. Konus-Wind observation of GRB 160104B
  20. Konus-Wind observation of GRB 160102A
  21. Konus-Wind observation of GRB 151231A
  22. Konus-Wind observation of GRB 160111A
  23. IPN Triangulation of GRB 160111A (short/hard)
  24. GRB 151225A: Correction to the trigger time of GCN 18724
  25. GRB 160113A: Swift-XRT observations
  26. GRB 160113A: Fermi GBM detection
  27. GRB 160113A: Swift ToO observations
  28. GRB 160113A: iPTF P48 Observations and Optical Transient Candidates
  29. Konus-Wind observation of GRB 160107A
  30. GRB 160104A: Swift/UVOT Detection
  31. IPN Triangulation of GRB 151231A
  32. Konus-Wind observation of GRB 151229B
  33. IPN Triangulation of GRB 151229B (extremely intense/long)
  34. GRB 160107A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 160107A: Fermi GBM observation
  36. LIGO/Virgo G211117: Pi of the Sky observations
  37. GRB 160104A: Continued MITSuME Akeno Optical Observation
  38. GRB 160107A: MAXI/GSC detection
  39. Konus-Wind observation of GRB 160101A
  40. Konus-Wind observation of GRB 151225A
  41. IPN Triangulation of GRB 151225A (short/hard)
  42. GRB 160104A: Nishi-Harima MINT Observations
  43. GRB 160104A: Spectroscopic observations from 10.4m GTC
  44. GRB 160104A: Swift-XRT refined Analysis
  45. GRB 160104A: Swift-BAT refined analysis
  46. GRB 160104A: Fermi GBM observation
  47. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  48. GRB 160104A: GWAC upper limit during prompt emission phase
  49. GRB 160104A: MITSuME Okayama upper limits
  50. GRB 160104A: Xinglong TNT optical observation
  51. GRB 160104A: Enhanced Swift-XRT position
  52. GRB 160104A: MASTER early OT detection
  53. GRB 160104A: MITSuME Okayama Ks-band upper-limit
  54. GRB 160104B: MAXI/GSC detection
  55. GRB 160104A: MITSuME Akeno Optical Observation
  56. GRB 160104A: LCOGT-FTN afterglow candidate
  57. GRB 160104A: Swift detection of a burst
  58. GRB 160101A: CALET Gamma-Ray Burst Monitor detection
  59. LIGO/Virgo G211117: Fermi/LAT observations
  60. GRB 151231A: CALET Gamma-Ray Burst Monitor detection
  61. GRB 160102A: Swift-XRT observations
  62. GRB 160101A: MITSuME Akeno optical upper limits
  63. GRB 160102A: Tiled Swift observations
  64. GRB 160102A: MAXI/GSC detection
  65. GRB 160101B: Fermi-LAT detection
  66. GRB 160101B: Fermi GBM detection
  67. GRB 160101A: Swift/UVOT Detection
  68. GRB 160101A: Fermi GBM observation
  69. GRB 160101A: Swift-XRT afterglow detection
  70. GRB 160101A: Tiled Swift observations
  71. GRB 160101A: MAXI/GSC detection
  72. GRB 151227B: CALET Gamma-Ray Burst Monitor detection
  73. GRB 151231B: Fermi GBM observation
  74. GRB 151231A: Fermi GBM observation
  75. Konus-Wind observation of GRB 151227B
  76. IPN Triangulation of GRB 151227B
  77. GRB 151228A: Correction to GCN 18770
  78. GRB 151228A: Swift-XRT refined Analysis
  79. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  80. V404Cyg Swift Trigger 668097: AbAO optical observations
  81. GRB 151228B: Swift/UVOT Detection
  82. GRB 151229A: MITSuME Akeno optical upper limits
  83. GRB 151229A: MITSuME Okayama upper limits
  84. GRB 151229A Swift-BAT Spectral lag analysis
  85. GRB 151228B: MITSuME Akeno optical upper limits
  86. GRB 151229A: Swift-XRT refined Analysis
  87. GRB 151229A: Fermi GBM observation
  88. GRB 151228B: Fermi GBM observation
  89. GRB 151228A: Swift-BAT refined analysis
  90. GRB 151229A: Swift/UVOT observations
  91. GRB 151228B: Swift-BAT refined analysis
  92. GRB 151229A: Swift-BAT refined analysis
  93. GRB 151229A: Enhanced Swift-XRT position
  94. GRB 151228B: Swift-XRT refined Analysis
  95. GRB 151228A: MITSuME Akeno optical upper limits
  96. GRB 151228A: T60 observations
  97. GRB 151229A: Swift detection of a short burst
  98. LIGO/Virgo G211117: DESGW program observations with DECam
  99. GRB 151228B: Enhanced Swift-XRT position
  100. LIGO/Virgo G211117: Fermi GBM Observations

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