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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"

38917 results found.

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

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