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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"
  1. GRB 080702B: Swift XRT and UVOT observations
  2. GRB 080625: Suzaku WAM observation of the prompt emission
  3. GRB 080702A: MITSuME Akeno optical upper limits
  4. GRB 080701A: Early RAPTOR optical limits
  5. Swift Trigger 315630: Swift/UVOT Upper Limits
  6. GRB 080702A, Swift-BAT refined analysis
  7. GRB 080702A: Swift-XRT Team refined analysis
  8. GRB 080702B : Burst detected in BAT during Swift slew
  9. GRB 080702A: Enhanced Swift-XRT position
  10. Swift Trigger 315630: TLS R-band observation
  11. Swift Trigger 315630: Probably not a GRB
  12. GRB 080702: Swift detection of a short burst
  13. GRB 080701: Swift-XRT refined analysis
  14. GRB 080701A, VATT optical upper limit
  15. TLS I-Band Observation of GRB 080701A
  16. GRB 080701A: Swift/UVOT Upper Limits
  17. GRB 080701A: Early Super-LOTIS Observations
  18. GRB 080701: Enhanced Swift-XRT position
  19. GRB 080701A, Swift-BAT refined analysis
  20. Trigger 315630: Swift detection of a possible burst
  21. GRB 080701: Swift-XRT Prompt Analysis
  22. GRB 080701: Swift detection of a burst
  23. GRB 080623: Suzaku WAM observation of the prompt emission
  24. GRB 080625: Swift/UVOT Follow-Up Observations
  25. GRB 080625: Further observations from OSN
  26. GRB 080625:Swift-XRT detection of the afterglow
  27. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  28. GRB 080625: Observations at OSN
  29. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  30. GRB 080623: GROND upper limits
  31. GRB080623: Swift UVOT followup observations
  32. GRB 080623: Swift-XRT refined analysis
  33. GRB 080623, Swift-BAT refined analysis
  34. GRB 080623: Enhanced Swift-XRT position
  35. GRB 080623: TAROT La Silla observatory optical observations
  36. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  37. GRB 080623: Swift XRT prompt analysis
  38. GRB 080623: Swift detection of a burst
  39. Swift trigger 314975 is not a GRB
  40. Swift-BAT trigger 314975 possible burst
  41. GRB080607: optical observation
  42. GRB 080603b: optical observation
  43. GRB 070809: Putative host galaxy and redshift
  44. VLA upper limit on INTEGRAL burst GRB 080613A
  45. GRB 0800603A: optical observation
  46. GRB080613B: MITSuME upper limits
  47. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  48. Konus-Wind observation of GRB 080613B
  49. GRB 080603A: optical observations on June 04
  50. GRB 080613A: Swift-XRT detection of the afterglow
  51. GRB080613A: Swift/UVOT Upper Limits
  52. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  53. GRB 080613B: GROND Upper Limits
  54. GRB 080613B - NOT optical and IR nondetections
  55. GRB080613B: Swift/UVOT Upper Limits
  56. GRB 080613B, Swift-BAT refined analysis
  57. GRB 080613B: Swift-XRT refined analysis
  58. GRB 080514B: Spectroscopic constraints and probable host galaxy
  59. GRB 080613B: Swift detection of a burst
  60. GRB 080613: Faulkes Telescope North optical candidate
  61. GRB 080613 : a long GRB detected with INTEGRAL
  62. GRB 080603A: Late-time Keck imaging and spectroscopy
  63. GRB 080603b: optical observation
  64. Swift observations of BAT Slew Survey event (Trigger=010)
  65. GRB 080603A: final Swift-XRT observations.
  66. GRB 080607: AGILE-MCAL observation of the prompt emission
  67. GRB 080603B - TLS 2nd Epoch: Another Break
  68. GRB 080605: TLS 3rd Epoch - Source Confusion
  69. GRB080605: optical observation with the MITSuME-OAO telescope
  70. Konus-Wind observation of GRB 080607
  71. GRB080607: RTT150 optical observations
  72. GRB 080603A: optical observations
  73. GRB 080607: Swift-XRT refined analysis
  74. Swift/UVOT Observations of GRB080607
  75. GRB 080605: optical observations
  76. GRB 080607 KAIT observations
  77. VLA detection of INTEGRAL burst GRB 080603A
  78. Konus-Wind observation of GRB 080605
  79. GRB 080607: Enhanced Swift-XRT position
  80. GRB 080607, Swift-BAT refined analysis
  81. GRB 080605: GROND 2nd epoch observations
  82. GRB 080607 - PAIRITEL NIR detection
  83. GRB 080607: Keck/LRIS spectroscopy and redshift
  84. GRB 080607: Super-LOTIS early observations
  85. GRB 080607: Swift detection of a burst with optical afterglow
  86. GRB 080607: ROTSE-III Detection of Optical Counterpart
  87. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  88. GRB 080605: Swift-UVOT refined analysis
  89. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  90. GRB 080604: VLA radio upper limit
  91. GRB 080605, Swift-BAT refined analysis
  92. GRB 080603B: VLA radio upper limit
  93. GRB 080605, Swift-BAT refined analysis
  94. GRB 080605: Swift-XRT refined analysis
  95. GRB080605: observation by BOOTES
  96. GRB 080605: MASTER VWF 46 s AT observation
  97. GRB 080605: Enhanced Swift-XRT position
  98. GRB 080605: GROND detection of the optical afterglow candidate
  99. GRB080605: optical observations
  100. GRB 080605: VLT redshift

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