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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"

28065 results found.

  1. GRB 080702B: Swift XRT confirmation of the afterglow
  2. GRB 080710: Lick IR detection
  3. GRB 0800707: optical observations
  4. GRB 080710: Rapid PROMPT Observations
  5. GRB 080710: Swift-XRT refined analysis
  6. GRB080710: Swift/UVOT observations
  7. GRB 080710: Enhanced Swift-XRT position
  8. GRB 080710: Faulkes Telescope North observations
  9. UVOT white band observations of GRB080710
  10. GRB 080710: REM afterglow confirmation & brightening
  11. GRB 080710: KAIT OA candidate
  12. GRB 080710: Swift XRT position
  13. GRB 080710: Swift detection of a burst
  14. GRB 080707: possible break in the X-rays
  15. New Swift-XRT GRB products available online.
  16. GRB 080707: GROND Confirmation of the Optical Afterglow
  17. UVOT observations of GRB080707
  18. GRB 080707: Swift XRT refined analysis
  19. GRB 080707: Enhanced Swift-XRT position
  20. GRB 080707: VLT redshift
  21. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  22. GRB 080707: Swift detection of a burst
  23. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  24. Trigger 316063: Swift detection of a transient
  25. GRB 080702B: GROND Upper Limits
  26. GRB 080703: Swift-XRT refined analysis
  27. GRB 080703: UVOT Follow-Up Observation
  28. GRB 080703: VLT observations of the afterglow
  29. GRB 080703: Enhanced Swift-XRT position
  30. GRB 080703: Swift detection of a burst with optical afterglow
  31. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  32. No radio detection from the short GRB 080702A
  33. Swift/UVOT observation of GRB080702A
  34. GRB 080702B: Swift XRT and UVOT observations
  35. GRB 080702A: MITSuME Akeno optical upper limits
  36. GRB 080701A: Early RAPTOR optical limits
  37. Swift Trigger 315630: Swift/UVOT Upper Limits
  38. GRB 080702A: Swift-XRT Team refined analysis
  39. GRB 080702B : Burst detected in BAT during Swift slew
  40. GRB 080702A: Enhanced Swift-XRT position
  41. Swift Trigger 315630: Probably not a GRB
  42. GRB 080702: Swift detection of a short burst
  43. GRB 080701: Swift-XRT refined analysis
  44. GRB 080701A, VATT optical upper limit
  45. GRB 080701A: Swift/UVOT Upper Limits
  46. GRB 080701A: Early Super-LOTIS Observations
  47. GRB 080701: Enhanced Swift-XRT position
  48. Trigger 315630: Swift detection of a possible burst
  49. GRB 080701: Swift-XRT Prompt Analysis
  50. GRB 080701: Swift detection of a burst
  51. GRB 080625: Swift/UVOT Follow-Up Observations
  52. GRB 080625:Swift-XRT detection of the afterglow
  53. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  54. GRB 080625: Observations at OSN
  55. GRB 080623: GROND upper limits
  56. GRB080623: Swift UVOT followup observations
  57. GRB 080623: Swift-XRT refined analysis
  58. GRB 080623: Enhanced Swift-XRT position
  59. GRB 080623: TAROT La Silla observatory optical observations
  60. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  61. GRB 080623: Swift XRT prompt analysis
  62. GRB 080623: Swift detection of a burst
  63. Swift trigger 314975 is not a GRB
  64. GRB080607: optical observation
  65. GRB 080603b: optical observation
  66. GRB 070809: Putative host galaxy and redshift
  67. VLA upper limit on INTEGRAL burst GRB 080613A
  68. GRB 0800603A: optical observation
  69. GRB080613B: MITSuME upper limits
  70. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  71. GRB 080603A: optical observations on June 04
  72. GRB 080613A: Swift-XRT detection of the afterglow
  73. GRB080613A: Swift/UVOT Upper Limits
  74. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  75. GRB 080613B: GROND Upper Limits
  76. GRB 080613B - NOT optical and IR nondetections
  77. GRB080613B: Swift/UVOT Upper Limits
  78. GRB 080613B: Swift-XRT refined analysis
  79. GRB 080514B: Spectroscopic constraints and probable host galaxy
  80. GRB 080613B: Swift detection of a burst
  81. GRB 080603A: Late-time Keck imaging and spectroscopy
  82. GRB 080603b: optical observation
  83. Swift observations of BAT Slew Survey event (Trigger=010)
  84. GRB 080603A: final Swift-XRT observations.
  85. GRB 080607: AGILE-MCAL observation of the prompt emission
  86. GRB 080603B - TLS 2nd Epoch: Another Break
  87. GRB 080605: TLS 3rd Epoch - Source Confusion
  88. GRB080605: optical observation with the MITSuME-OAO telescope
  89. GRB080607: RTT150 optical observations
  90. GRB 080603A: optical observations
  91. GRB 080607: Swift-XRT refined analysis
  92. Swift/UVOT Observations of GRB080607
  93. GRB 080605: optical observations
  94. GRB 080607 KAIT observations
  95. VLA detection of INTEGRAL burst GRB 080603A
  96. GRB 080607: Enhanced Swift-XRT position
  97. GRB 080605: GROND 2nd epoch observations
  98. GRB 080607 - PAIRITEL NIR detection
  99. GRB 080607: Swift detection of a burst with optical afterglow
  100. GRB 080607: ROTSE-III Detection of Optical Counterpart

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