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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"

28084 results found.

  1. GRB 080714: Swift detection of a burst
  2. GRB 080702A: optical upper limit
  3. GRB 080603A: CrAO optical observations
  4. GRB 080702B: Swift XRT confirmation of the afterglow
  5. GRB 080710: Lick IR detection
  6. GRB 080710, Swift-BAT refined analysis
  7. GRB 0800707: optical observations
  8. GRB 080710: Swift-XRT refined analysis
  9. GRB080710: Swift/UVOT observations
  10. GRB 080710: Enhanced Swift-XRT position
  11. UVOT white band observations of GRB080710
  12. GRB 080710: REM afterglow confirmation & brightening
  13. GRB 080710: Swift XRT position
  14. New Swift-XRT GRB products available online.
  15. GRB 080707: GROND Confirmation of the Optical Afterglow
  16. UVOT observations of GRB080707
  17. GRB 080707, Swift-BAT refined analysis
  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 080703: GROND Upper Limits
  26. GRB 080702B: GROND Upper Limits
  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-BAT refined analysis
  31. GRB 080702B Swift-BAT refined analysis
  32. GRB 080703: Swift detection of a burst with optical afterglow
  33. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  34. No radio detection from the short GRB 080702A
  35. Swift/UVOT observation of GRB080702A
  36. GRB 080702B: Swift XRT and UVOT observations
  37. GRB 080625: Suzaku WAM observation of the prompt emission
  38. GRB 080701A: Early RAPTOR optical limits
  39. Swift Trigger 315630: Swift/UVOT Upper Limits
  40. GRB 080702A, Swift-BAT refined analysis
  41. GRB 080702A: Swift-XRT Team refined analysis
  42. GRB 080702B : Burst detected in BAT during Swift slew
  43. GRB 080702A: Enhanced Swift-XRT position
  44. Swift Trigger 315630: TLS R-band observation
  45. Swift Trigger 315630: Probably not a GRB
  46. GRB 080702: Swift detection of a short burst
  47. GRB 080701A, VATT optical upper limit
  48. TLS I-Band Observation of GRB 080701A
  49. GRB 080701A: Swift/UVOT Upper Limits
  50. GRB 080701: Enhanced Swift-XRT position
  51. GRB 080701A, Swift-BAT refined analysis
  52. Trigger 315630: Swift detection of a possible burst
  53. GRB 080701: Swift-XRT Prompt Analysis
  54. GRB 080701: Swift detection of a burst
  55. GRB 080623: Suzaku WAM observation of the prompt emission
  56. GRB 080625: Further observations from OSN
  57. GRB 080625:Swift-XRT detection of the afterglow
  58. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  59. GRB 080625: Observations at OSN
  60. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  61. GRB 080623: GROND upper limits
  62. GRB 080623: Swift-XRT refined analysis
  63. GRB 080623, Swift-BAT refined analysis
  64. GRB 080623: Enhanced Swift-XRT position
  65. GRB 080623: TAROT La Silla observatory optical observations
  66. GRB 080623: Swift XRT prompt analysis
  67. Swift trigger 314975 is not a GRB
  68. GRB080607: optical observation
  69. GRB 070809: Putative host galaxy and redshift
  70. VLA upper limit on INTEGRAL burst GRB 080613A
  71. GRB080613B: MITSuME upper limits
  72. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  73. GRB 080603A: optical observations on June 04
  74. GRB 080613A: Swift-XRT detection of the afterglow
  75. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  76. GRB 080613B: GROND Upper Limits
  77. GRB 080613B - NOT optical and IR nondetections
  78. GRB 080613B, Swift-BAT refined analysis
  79. GRB 080613B: Swift-XRT refined analysis
  80. GRB 080514B: Spectroscopic constraints and probable host galaxy
  81. GRB 080613B: Swift detection of a burst
  82. GRB 080613: Faulkes Telescope North optical candidate
  83. GRB 080613 : a long GRB detected with INTEGRAL
  84. GRB 080603A: Late-time Keck imaging and spectroscopy
  85. GRB 080603b: optical observation
  86. GRB 080603A: final Swift-XRT observations.
  87. GRB 080607: AGILE-MCAL observation of the prompt emission
  88. GRB 080603B - TLS 2nd Epoch: Another Break
  89. GRB 080605: TLS 3rd Epoch - Source Confusion
  90. GRB080605: optical observation with the MITSuME-OAO telescope
  91. GRB080607: RTT150 optical observations
  92. GRB 080603A: optical observations
  93. GRB 080607: Swift-XRT refined analysis
  94. Swift/UVOT Observations of GRB080607
  95. VLA detection of INTEGRAL burst GRB 080603A
  96. GRB 080607: Enhanced Swift-XRT position
  97. GRB 080607, Swift-BAT refined analysis
  98. GRB 080605: GROND 2nd epoch observations
  99. GRB 080607: Keck/LRIS spectroscopy and redshift
  100. GRB 080607: Swift detection of a burst with optical afterglow

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