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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

21469 results found.

  1. GRB 080702B Swift-BAT refined analysis
  2. GRB 080703: Swift detection of a burst with optical afterglow
  3. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  4. No radio detection from the short GRB 080702A
  5. Swift/UVOT observation of GRB080702A
  6. GRB 080702B: Swift XRT and UVOT observations
  7. GRB 080702A: MITSuME Akeno optical upper limits
  8. GRB 080701A: Early RAPTOR optical limits
  9. Swift Trigger 315630: Swift/UVOT Upper Limits
  10. GRB 080702A, Swift-BAT refined analysis
  11. GRB 080702A: Swift-XRT Team refined analysis
  12. GRB 080702B : Burst detected in BAT during Swift slew
  13. GRB 080702A: Enhanced Swift-XRT position
  14. Swift Trigger 315630: TLS R-band observation
  15. Swift Trigger 315630: Probably not a GRB
  16. GRB 080702: Swift detection of a short burst
  17. GRB 080701: Swift-XRT refined analysis
  18. GRB 080701A, VATT optical upper limit
  19. TLS I-Band Observation of GRB 080701A
  20. GRB 080701A: Swift/UVOT Upper Limits
  21. GRB 080701A: Early Super-LOTIS Observations
  22. GRB 080701: Enhanced Swift-XRT position
  23. GRB 080701A, Swift-BAT refined analysis
  24. Trigger 315630: Swift detection of a possible burst
  25. GRB 080701: Swift-XRT Prompt Analysis
  26. GRB 080701: Swift detection of a burst
  27. GRB 080623: Suzaku WAM observation of the prompt emission
  28. GRB 080625: Swift/UVOT Follow-Up Observations
  29. GRB 080625:Swift-XRT detection of the afterglow
  30. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  31. GRB 080623: GROND upper limits
  32. GRB080623: Swift UVOT followup observations
  33. GRB 080623: Swift-XRT refined analysis
  34. GRB 080623, Swift-BAT refined analysis
  35. GRB 080623: Enhanced Swift-XRT position
  36. GRB 080623: TAROT La Silla observatory optical observations
  37. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  38. GRB 080623: Swift XRT prompt analysis
  39. GRB 080623: Swift detection of a burst
  40. Swift trigger 314975 is not a GRB
  41. Swift-BAT trigger 314975 possible burst
  42. GRB080607: optical observation
  43. GRB 080603b: optical observation
  44. GRB 070809: Putative host galaxy and redshift
  45. VLA upper limit on INTEGRAL burst GRB 080613A
  46. GRB080613B: MITSuME upper limits
  47. Konus-Wind observation of GRB 080613B
  48. GRB 080613A: Swift-XRT detection of the afterglow
  49. GRB080613A: Swift/UVOT Upper Limits
  50. GRB 080613B: GROND Upper Limits
  51. GRB 080613B - NOT optical and IR nondetections
  52. GRB080613B: Swift/UVOT Upper Limits
  53. GRB 080613B, Swift-BAT refined analysis
  54. GRB 080613B: Swift-XRT refined analysis
  55. GRB 080613B: Swift detection of a burst
  56. GRB 080603b: optical observation
  57. Swift observations of BAT Slew Survey event (Trigger=010)
  58. GRB 080603A: final Swift-XRT observations.
  59. GRB 080607: AGILE-MCAL observation of the prompt emission
  60. GRB 080603B - TLS 2nd Epoch: Another Break
  61. GRB 080605: TLS 3rd Epoch - Source Confusion
  62. Konus-Wind observation of GRB 080607
  63. GRB080607: RTT150 optical observations
  64. GRB 080607: Swift-XRT refined analysis
  65. Swift/UVOT Observations of GRB080607
  66. GRB 080605: optical observations
  67. GRB 080607 KAIT observations
  68. Konus-Wind observation of GRB 080605
  69. GRB 080607: Enhanced Swift-XRT position
  70. GRB 080607, Swift-BAT refined analysis
  71. GRB 080605: GROND 2nd epoch observations
  72. GRB 080607: Swift detection of a burst with optical afterglow
  73. GRB 080607: ROTSE-III Detection of Optical Counterpart
  74. GRB 080605: Swift-UVOT refined analysis
  75. GRB 080604: VLA radio upper limit
  76. GRB 080605, Swift-BAT refined analysis
  77. GRB 080603B: VLA radio upper limit
  78. GRB 080605, Swift-BAT refined analysis
  79. GRB 080605: Swift-XRT refined analysis
  80. GRB 080605: MASTER VWF 46 s AT observation
  81. GRB 080605: Enhanced Swift-XRT position
  82. GRB 080605: GROND detection of the optical afterglow candidate
  83. GRB080605: optical observations
  84. GRB 080605: Liverpool Telescope optical afterglow candidate
  85. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  86. GRB 080605: TLS RRM Afterglow
  87. GRB 080605: Swift detection of a burst with an optical afterglow
  88. GRB 080603B: TLS Afterglow Observation
  89. Swift/UVOT observations of GRB080604
  90. GRB 080604, Swift-BAT refined analysis
  91. GRB 080604: Swift-XRT refined analysis
  92. GRB 080603B : Liverpool Telescope Observations
  93. Konus-Wind observation of GRB 080603B
  94. GRB 080603B: Swift-XRT refined analysis
  95. GRB 080603A: Swift-XRT detection of the afterglow
  96. GRB 080603B: Swift/UVOT detection of the afterglow
  97. GRB 080604: Enhanced Swift-XRT position
  98. GRB 080603B, Swift-BAT refined analysis
  99. GRB 080603A: Swift/UVOT detection of the afterglow
  100. GRB080603B: RTT150 optical observations, break in light curves

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