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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"

39149 results found.

  1. GRB 080707: possible break in the X-rays
  2. New Swift-XRT GRB products available online.
  3. GRB 080707: GROND Confirmation of the Optical Afterglow
  4. UVOT observations of GRB080707
  5. GRB 080707, Swift-BAT refined analysis
  6. GRB 080707: Swift XRT refined analysis
  7. GRB 080707: Enhanced Swift-XRT position
  8. GRB 080707: VLT redshift
  9. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  10. GRB 080707: Swift detection of a burst
  11. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  12. Trigger 316063: Swift detection of a transient
  13. GRB 080703: GROND Upper Limits
  14. GRB 080702B: GROND Upper Limits
  15. GRB 080703: Swift-XRT refined analysis
  16. GRB 080703: UVOT Follow-Up Observation
  17. GRB 080703: VLT observations of the afterglow
  18. GRB 080703: Enhanced Swift-XRT position
  19. GRB 080703, Swift-BAT refined analysis
  20. GRB 080702B Swift-BAT refined analysis
  21. GRB 080703: Swift detection of a burst with optical afterglow
  22. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  23. No radio detection from the short GRB 080702A
  24. GRB 080702b: LCO optical observations
  25. GRB 080702B: Swift XRT and UVOT observations
  26. GRB 080625: Suzaku WAM observation of the prompt emission
  27. GRB 080702A: MITSuME Akeno optical upper limits
  28. GRB 080701A: Early RAPTOR optical limits
  29. GRB 080702A, Swift-BAT refined analysis
  30. GRB 080702A: Swift-XRT Team refined analysis
  31. GRB 080702B : Burst detected in BAT during Swift slew
  32. GRB 080702A: Enhanced Swift-XRT position
  33. Swift Trigger 315630: Probably not a GRB
  34. GRB 080702: Swift detection of a short burst
  35. GRB 080701: Swift-XRT refined analysis
  36. GRB 080701A, VATT optical upper limit
  37. TLS I-Band Observation of GRB 080701A
  38. GRB 080701A: Swift/UVOT Upper Limits
  39. GRB 080701A: Early Super-LOTIS Observations
  40. GRB 080701: Enhanced Swift-XRT position
  41. GRB 080701A, Swift-BAT refined analysis
  42. Trigger 315630: Swift detection of a possible burst
  43. GRB 080701: Swift-XRT Prompt Analysis
  44. GRB 080701: Swift detection of a burst
  45. GRB 080623: Suzaku WAM observation of the prompt emission
  46. GRB 080625: Swift/UVOT Follow-Up Observations
  47. GRB 080625: Further observations from OSN
  48. GRB 080625:Swift-XRT detection of the afterglow
  49. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  50. GRB 080625: Observations at OSN
  51. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  52. GRB 080623: GROND upper limits
  53. GRB080623: Swift UVOT followup observations
  54. GRB 080623: Swift-XRT refined analysis
  55. GRB 080623, Swift-BAT refined analysis
  56. GRB 080623: Enhanced Swift-XRT position
  57. GRB 080623: TAROT La Silla observatory optical observations
  58. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  59. GRB 080623: Swift XRT prompt analysis
  60. GRB 080623: Swift detection of a burst
  61. Swift trigger 314975 is not a GRB
  62. Swift-BAT trigger 314975 possible burst
  63. GRB080607: optical observation
  64. GRB 080603b: optical observation
  65. GRB 070809: Putative host galaxy and redshift
  66. VLA upper limit on INTEGRAL burst GRB 080613A
  67. GRB 0800603A: optical observation
  68. GRB080613B: MITSuME upper limits
  69. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  70. Konus-Wind observation of GRB 080613B
  71. GRB 080603A: optical observations on June 04
  72. GRB 080613A: Swift-XRT detection of the afterglow
  73. GRB080613A: Swift/UVOT Upper Limits
  74. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  75. GRB 080613B: GROND Upper Limits
  76. GRB 080613B - NOT optical and IR nondetections
  77. GRB080613B: Swift/UVOT Upper Limits
  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. Swift observations of BAT Slew Survey event (Trigger=010)
  87. GRB 080603A: final Swift-XRT observations.
  88. GRB 080607: AGILE-MCAL observation of the prompt emission
  89. GRB 080603B - TLS 2nd Epoch: Another Break
  90. GRB 080605: TLS 3rd Epoch - Source Confusion
  91. GRB080605: optical observation with the MITSuME-OAO telescope
  92. Konus-Wind observation of GRB 080607
  93. GRB 080603A: optical observations
  94. GRB 080607: Swift-XRT refined analysis
  95. Swift/UVOT Observations of GRB080607
  96. GRB 080605: optical observations
  97. GRB 080607 KAIT observations
  98. VLA detection of INTEGRAL burst GRB 080603A
  99. Konus-Wind observation of GRB 080605
  100. GRB 080607: Enhanced Swift-XRT position

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