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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"

7293 results found.

  1. GRB 110328A: Swift detection of a burst
  2. GRB 110319B BAT refined analysis
  3. GRB 110319B: GROND upper limits
  4. GRB 110319B: Swift-XRT afterglow candidate.
  5. GRB 110319A: Swift detection of a burst
  6. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  7. GRB 110315A: Swift detection of a burst
  8. GRB 110312A: Swift detection of a burst
  9. No IPN GRB detected in conjunction with candidate GRB 110215
  10. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  11. GRB 110223B: Swift detection of a burst
  12. GRB 110223A: Swift detection of a burst
  13. OT 110215: Further NIR observations from NOT of the GRB candidate
  14. Fermi GBM detection of an SGR-like burst
  15. OT 110215: NIR observations from NOT of GRB candidate
  16. GRB 110213B: Gemini South Redshift
  17. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  18. GRB 110213B: P60 Optical Afterglow Candidate
  19. GRB 110212A: Swift XRT and UVOT observations
  20. GRB 110213B: Swift XRT observation
  21. GRB 110213A: Swift detection of a burst with optical afterglow
  22. GRB 110210A: Swift detection of a burst
  23. Fermi GBM detection of a burst from 1E 1841-045
  24. GRB 110206A: SMARTS optical/IR afterglow decay
  25. GRB 110208A: Swift detection of a burst
  26. GRB 110206A: Decay of afterglow candidate
  27. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  28. GRB 110206A: GROND detection of afterglow candidate
  29. GRB 110206A: UVOT detection of afterglow candidate
  30. GRB 110205A: Newcastle Observatory Optical Observations
  31. GRB 110205A: Liverpool Telescope Afterglow Confirmation
  32. GRB 110205A: TAROT Calern observatory optical detection
  33. GRB 110205A: Swift detection of a burst with an optical candidate
  34. GRB 110201A: Swift detection of a burst
  35. GRB 110128A: Swift detection of a burst
  36. GRB 110106A: CrAO optical observations
  37. GRB 110119A: Swift detection of a burst with an optical detection
  38. Swift-BAT trigger 442771 is a noise fluctuation
  39. Swift Trigger 442539 is probably not a GRB
  40. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  41. GRB 110112A: WHT candidate afterglow/host galaxy
  42. GRB110112A: TNT optical afterglow candidate
  43. GRB 110112A: Swift detection of a possible short burst
  44. GRB 110107A: Swift-XRT Afterglow Candidate
  45. Short GRB 110106A: MASTER OT observations
  46. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  47. GRB 110106B: WHT candidate afterglow
  48. GRB 110106B: Swift detection of a burst
  49. GRB 110106A: TNG optical observations and candidate counterparts
  50. GRB 110106A: Swift detection of a burst
  51. GRB 101219A: Gemini-North host redshift
  52. GRB110102A: MITSuME Okayama Optical Observation
  53. GRB 110102A: Swift detection of a burst with an optical detection
  54. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  55. GRB 101224A: Swift detection of a short burst
  56. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  57. GRB 101219B: Swift detection of a burst with an optical afterglow
  58. GRB 101219A: GROND Upper limits
  59. GRB 101219A: SARA-N Upper Limit
  60. GRB 101219A: Swift detection of a short hard burst
  61. Redshift solution(s) for GRB101213A from Swift-XRT data
  62. GRB 101213A: Swift detection of a burst
  63. GRB101204A: Swift/UVOT observations
  64. GRB101204A GROND Detection of the Optical/NIR Afterglow
  65. GRB 101204A Afterglow Candidate, VATT Observations
  66. GRB 101204A Swift-XRT/UVOT afterglow candidate
  67. GRB 101123A: ROTSE optical observations
  68. GRB 101117B: Swift detection of a burst
  69. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  70. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  71. GRB101112A: Liverpool Telescope Afterglow Candidate
  72. GRB 101030A: GROND optical/NIR afterglow candidate
  73. GRB 101030A: Swift detection of a burst
  74. GRB 101024A: Zadko observatory - Gingin. Optical observations
  75. GRB 101024A: Swift detection of a burst with an optical afterglow
  76. GRB 101023A: REM NIR observations
  77. GRB 101023A: Swift detection of a burst
  78. GRB 101008A: optical observations
  79. GRB 101017A: Swift detection of a burst with optical counterpart
  80. GRB 101011A: Swift detection of a burst
  81. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  82. Swift Trigger 435520 is probably not a GRB
  83. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  84. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  85. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  86. GRB100925A UVOT afterglow
  87. GRB 100925A: Swift detection of a burst
  88. GRB 100915A: Swift detection of a likely burst
  89. Swift BAT Trigger 433953 probably not a GRB
  90. GRB 100909A: Faulkes Telescope North afterglow candidate
  91. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  92. GRB 100909A: Swift target of opportunity observation
  93. GRB 100906A : Faulkes Telescope North optical observations
  94. GRB 100906A: Swift detection of a burst with an optical afterglow
  95. GRB 100905A: Swift detection of a burst
  96. GRB 100902A: UKIRT JK Observation
  97. GRB 100902A: GROND observations; afterglow candidate
  98. GRB 100902A: Swift detection of a burst
  99. GRB 100901A: ROTSE-III Detection
  100. GRB 100901A: confirmation of the afterglow

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