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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"

36397 results found.

  1. GRB 130215: ROTSE-III Detection of Optical Counterpart
  2. GRB 130215A: Swift detection of a burst
  3. GRB 130131B: CTIO 0.9-m optical upper-limits
  4. GRB 121128A: optical observations
  5. GRB 121123A: optical observations
  6. GRB 130211A: Swift/UVOT Upper Limits
  7. GRB 130211A: Swift-XRT refined Analysis
  8. GRB 130211A: Swift-BAT refined analysis
  9. GRB 130211A: GROND detection of the afterglow
  10. GRB 130211A: Swift detection of a burst
  11. GRB 130131A: MITSuME Akeno Optical upper limits
  12. GRB 130131B: MITSuME Akeno Optical upper limits
  13. GRB 130122A: PTF P48 optical upper limits
  14. GRB 130206A: GROND Observations
  15. GRB 130206A: Fermi LAT Observations
  16. GRB 130206A: Fermi GBM observation
  17. GRB 130206A: XRT and UVOT follow-up observations.
  18. GRB 130131B: optical upper limit in Mondy observatory
  19. GRB 130206A, Swift-BAT refined analysis
  20. GRB 130206A: Zadko observatory - Gingin optical observations
  21. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  22. GRB 130206A: Swift-XRT observations
  23. GRB 130131A: optical observation in Mondy observatory
  24. GRB 130206A: Swift detection of a burst
  25. GRB 130131A: Swift/UVOT Upper Limits
  26. GRB 130131B: RATIR Upper Limits
  27. GRB 130131A: RATIR optical and infrared upper limits
  28. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  29. GRB 130131B: Swift-XRT refined Analysis
  30. GRB 130131A - UKIRT confirmation of afterglow
  31. GRB 130131B: VLT/X-shooter acquisition camera limits
  32. GRB 130131B: GROND Upper limits
  33. GRB 130131A: CARMA 3mm Observations
  34. GRB 130131A: VLA 5.8 Ghz Detection
  35. GRB 130131B: IAC80 I-band observations
  36. GRB 130131B: Swift/UVOT Upper Limits
  37. GRB 130131A: Swift-XRT refined Analysis
  38. GRB 130131B: MITSuME Okayama optical upper limits
  39. GRB 130131A: MITSuME Okayama optical upper limits
  40. GRB 130131B: Enhanced Swift-XRT position
  41. GRB 130131B: Swift-BAT refined analysis
  42. GRB 130131A: Swift-BAT refined analysis
  43. GRB 130131B: TAROT Calern observatory optical observations
  44. GRB 130131B: Zadko observatory - Gingin optical observations
  45. GRB 130131A: Enhanced Swift-XRT position
  46. GRB 130131B: Swift detection of a burst
  47. GRB 130131A - Faulkes Telescope North Observations
  48. GRB 130131A - UKIRT afterglow candidate
  49. GRB 130131A: Swift detection of a burst
  50. GRB 130127A: Fermi GBM detection
  51. GRB 130122A: RTT150 optical observations
  52. GRB 130122A: CARMA 3mm Observations
  53. GRB 130122A: Swift/UVOT Detection
  54. GRB 130122A: optical observations
  55. GRB 130122A: RATIR Detection
  56. GRB 130122A: Swift-BAT refined analysis
  57. GRB 130122A: Swift-XRT refined Analysis
  58. GRB 130122A: Xinglong optical upper limit
  59. GRB 130122A: Enhanced Swift-XRT position
  60. GRB 130122A: MASTER-Net early marginal detection of the OT
  61. GRB 130122A: T100 observations
  62. GRB 130122A: Swift detection of a burst with an optical counterpart
  63. Short GRB 121226A: TNG observation of the host galaxy
  64. GRB 121225B: Suzaku WAM observation of the prompt emission
  65. GRB 130102B: MASTER synchronous observations
  66. GRB 130102A: Swift/UVOT Upper Limits
  67. Konus-Wind observation of GRB 130102B
  68. GRB 130102A: P60 Observations
  69. GRB 130102A: Swift-BAT refined analysis
  70. GRB 130102A: MASTER-Net optical observations
  71. GRB 130102A: Swift-XRT refined Analysis
  72. GRB 130102B: MAXI/GSC detection
  73. GRB 130102A: Enhanced Swift-XRT position
  74. GRB 130102A: IAC80 I-band observations
  75. GRB 130102A: Swift detection of a burst
  76. GRB 121226A: 5.8 GHz VLA observations
  77. Swift Trigger 544381 is a noise event
  78. GRB 121229A: Swift-XRT refined Analysis
  79. GRB 121229A, Swift-BAT refined analysis
  80. GRB 121229A: Swift/UVOT Upper Limits
  81. GRB 121229A: Enhanced Swift-XRT position
  82. GRB 121229A: VLT/X-shooter redshift
  83. Swift Trigger 544381 is unlikely to be a GRB
  84. GRB 121229A: MAXI/GSC detection
  85. GRB 121229A: GROND detection of the afterglow
  86. GRB 121229A: Swift detection of a burst
  87. GRB 121226A: 10.4m GTC optical observations
  88. GRB 121226A: Swift/UVOT Upper Limits
  89. GRB 121226A: Swift-XRT refined Analysis
  90. GRB 121226A, Swift-BAT refined analysis
  91. GRB 121226A: NOT optical upper limit
  92. GRB 121226A: Optical Observations
  93. GRB 121226A: MITSuME Okayama Optical upper limits
  94. GRB 121226A: Zadko observatory - Gingin optical observations
  95. GRB 121226A: BOOTES-4/MET optical observations
  96. GRB 121226A: Swift detection of a burst
  97. Konus-Wind observation of GRB 121225B
  98. IPN Triangulation of GRB 121225B
  99. GRB 121225B: Fermi GBM observation
  100. GRB 121225B: Fermi LAT Detection

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