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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"

28083 results found.

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

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