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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"

28040 results found.

  1. Swift Trigger 315630: Probably not a GRB
  2. GRB 080702: Swift detection of a short burst
  3. GRB 080701A, VATT optical upper limit
  4. TLS I-Band Observation of GRB 080701A
  5. GRB 080701A: Swift/UVOT Upper Limits
  6. GRB 080701: Enhanced Swift-XRT position
  7. GRB 080701A, Swift-BAT refined analysis
  8. Trigger 315630: Swift detection of a possible burst
  9. GRB 080701: Swift-XRT Prompt Analysis
  10. GRB 080701: Swift detection of a burst
  11. GRB 080623: Suzaku WAM observation of the prompt emission
  12. GRB 080625: Further observations from OSN
  13. GRB 080625:Swift-XRT detection of the afterglow
  14. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  15. GRB 080625: Observations at OSN
  16. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  17. GRB 080623: GROND upper limits
  18. GRB 080623: Swift-XRT refined analysis
  19. GRB 080623, Swift-BAT refined analysis
  20. GRB 080623: Enhanced Swift-XRT position
  21. GRB 080623: TAROT La Silla observatory optical observations
  22. GRB 080623: Swift XRT prompt analysis
  23. Swift trigger 314975 is not a GRB
  24. GRB080607: optical observation
  25. GRB 070809: Putative host galaxy and redshift
  26. VLA upper limit on INTEGRAL burst GRB 080613A
  27. GRB080613B: MITSuME upper limits
  28. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  29. GRB 080603A: optical observations on June 04
  30. GRB 080613A: Swift-XRT detection of the afterglow
  31. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  32. GRB 080613B: GROND Upper Limits
  33. GRB 080613B - NOT optical and IR nondetections
  34. GRB 080613B, Swift-BAT refined analysis
  35. GRB 080613B: Swift-XRT refined analysis
  36. GRB 080514B: Spectroscopic constraints and probable host galaxy
  37. GRB 080613B: Swift detection of a burst
  38. GRB 080613: Faulkes Telescope North optical candidate
  39. GRB 080613 : a long GRB detected with INTEGRAL
  40. GRB 080603A: Late-time Keck imaging and spectroscopy
  41. GRB 080603b: optical observation
  42. GRB 080603A: final Swift-XRT observations.
  43. GRB 080607: AGILE-MCAL observation of the prompt emission
  44. GRB 080603B - TLS 2nd Epoch: Another Break
  45. GRB 080605: TLS 3rd Epoch - Source Confusion
  46. GRB080605: optical observation with the MITSuME-OAO telescope
  47. GRB080607: RTT150 optical observations
  48. GRB 080603A: optical observations
  49. GRB 080607: Swift-XRT refined analysis
  50. Swift/UVOT Observations of GRB080607
  51. VLA detection of INTEGRAL burst GRB 080603A
  52. GRB 080607: Enhanced Swift-XRT position
  53. GRB 080607, Swift-BAT refined analysis
  54. GRB 080605: GROND 2nd epoch observations
  55. GRB 080607: Keck/LRIS spectroscopy and redshift
  56. GRB 080607: Swift detection of a burst with optical afterglow
  57. GRB 080607: ROTSE-III Detection of Optical Counterpart
  58. GRB 080605: Swift-UVOT refined analysis
  59. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  60. GRB 080604: VLA radio upper limit
  61. GRB 080605, Swift-BAT refined analysis
  62. GRB 080603B: VLA radio upper limit
  63. GRB 080605, Swift-BAT refined analysis
  64. GRB 080605: Swift-XRT refined analysis
  65. GRB 080605: MASTER VWF 46 s AT observation
  66. GRB 080605: Enhanced Swift-XRT position
  67. GRB 080605: GROND detection of the optical afterglow candidate
  68. GRB 080605: Liverpool Telescope optical afterglow candidate
  69. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  70. GRB 080605: Swift detection of a burst with an optical afterglow
  71. GRB 080603B: TLS Afterglow Observation
  72. GRB 080603A: TLS Afterglow Observation
  73. GRB 080604: MITSuME Okayama observation
  74. GRB 080604, Swift-BAT refined analysis
  75. GRB 080604: Swift-XRT refined analysis
  76. GRB 080603B : Liverpool Telescope Observations
  77. Konus-Wind observation of GRB 080603B
  78. GRB 080603B: Swift-XRT refined analysis
  79. GRB 080603A: Swift-XRT detection of the afterglow
  80. GRB 080430: optical observations
  81. GRB 080603B: Swift/UVOT detection of the afterglow
  82. GRB 080604: Enhanced Swift-XRT position
  83. GRB 080603B, Swift-BAT refined analysis
  84. GRB080603B: RTT150 optical observations, break in light curves
  85. GRB 080604: Swift detection of a burst with an optical afterglow
  86. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  87. GRB 080516: TAROT La Silla observatory optical observations
  88. GRB080603B: NOT redshift
  89. GRB 080603B: BOOTES2/TELMA optical observations
  90. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  91. GRB 080603B: Swift detection of a burst with optical afterglow
  92. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  93. GRB 080603: A long GRB detected by INTEGRAL
  94. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  95. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  96. GRB 080602, Swift-BAT refined analysis
  97. GRB 080602: Swift-XRT refined analysis
  98. Konus-Wind observation of GRB 080602
  99. GRB 080602: NOT R-band upper limit
  100. GRB 080602: Enhanced Swift-XRT position

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