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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32721 results found.

  1. GRB090902B: Swift/UVOT observations
  2. GRB 090902B: Swift/XRT Afterglow Candidate
  3. GRB 090831A: IPN Triangulation
  4. GRB 090831C BAT refined analysis
  5. GRB 090831C: GROND upper limits
  6. Konus-Wind observations of GRB 090831A
  7. Swift Trigger 361477, called GRB090831B, is probably not real.
  8. GRB090831C: Swift/UVOT upper limits
  9. GRB 090831B: MITSuME optical upper limits
  10. GRB 090831C: Swift XRT Refined Analysis
  11. GRB 090831B, RIMOTS optical upper limits
  12. GRB 090831: MAXI GSC detection
  13. Konus-Wind observations of GRB 090827
  14. GRB 090827: Swift XRT and UVOT observations
  15. GRB 090817 - TLS Observations
  16. GRB090817: Keck/LRIS Spectroscopy
  17. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  18. GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
  19. GRB 090823 Correction to BAT position
  20. GRB 090817: No host galaxy, no supernova
  21. Konus-Wind observations of GRB 090823
  22. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  23. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  24. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  25. GRB 090820: MASTER-Net optical polarization observations
  26. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  27. GRB 090817: Liverpool Telescope Observations
  28. GRB 090817: optical upper limit
  29. GRB 090817: Confirmation of the X-ray afterglow
  30. GRB 090815C: Swift refined analysis
  31. GRB 090817: Fermi GBM observation
  32. GRB 090817: Swift/UVOT Upper Limits
  33. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  34. GRB 090813: I-band observations from 1.5m OSN telescope
  35. GRB 090817: Swift-XRT observations
  36. GRB 090814A: optical observations
  37. GRB 090813: Suzaku WAM observation of the prompt emission
  38. GRB 090812: Suzaku WAM observation of the prompt emission
  39. VLA radio non-detection of GRB 090812
  40. GRB 090813: CrAO optical obsevations
  41. GRB 090814B: Confirmation of the X-ray afterglow
  42. GRB090814A: NOT optical follow-ups
  43. GRB 090814B: I-band observations from 1.23m CAHA telescope
  44. GRB 090814B: Swift/UVOT Upper Limits
  45. GRB 090814B: Liverpool Telescope Observations
  46. GRB 090814B: Swift-XRT detection of a possible afterglow.
  47. GRB 090814A: Swift/UVOT Observations
  48. GRB 090814A: Swift-XRT Team Refined Analysis
  49. GRB 090814A, RIMOTS optical upper limits
  50. GRB 090814A: Swift-BAT refined analysis
  51. GRB 090813: correction to GCN 9787
  52. GRB090814A: VLT spectroscopy
  53. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  54. GRB 090813: Fermi GBM observation
  55. GRB 090813: Swift-XRT refined analysis
  56. GRB 090813, Swift-BAT refined analysis
  57. Konus-Wind observations of GRB090813
  58. GRB090813: Swift/UVOT upper limits
  59. GRB 090813: Liverpool Telescope afterglow confirmation
  60. GRB 090813: P60 Optical Afterglow Confirmation
  61. GRB 090813: optical candidate from 1.23m CAHA telescope
  62. GRB 090812: WIRO NIR upper limit
  63. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  64. GRB 090812: RAPTOR detections during the burst
  65. GRB 090812: Swift XRT refined analysis
  66. GRB 090812, RIMOTS optical upper limits
  67. GRB 090812 Swift-BAT Refined Analysis
  68. GRB090812: Swift/UVOT observations
  69. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  70. GRB 090812: Liverpool Telescope afterglow confirmation
  71. GRB 090812: P60 Confirmation of Optical Afterglow
  72. GRB 090809: Further NOT optical observations
  73. VLA radio upper limit on GRB 090809
  74. GRB 090621B: MAGIC telescope GeV observation
  75. GRB 090621A: MAGIC telescope GeV observation
  76. GRB 090809: WHT observations
  77. GRB 090809: Swift-XRT refined analysis
  78. GRB090809: Swift/UVOT observations
  79. GRB 090809: Swift-BAT refined analysis
  80. GRB 090809: afterglow confirmation at the NOT
  81. GRB 090807: Liverpool Telescope observations
  82. GRB 090807: MITSuME optical upper limit
  83. GRB 090807: Swift/UVOT Upper Limits
  84. GRB 090807: Swift-XRT refined analysis
  85. GRB 090807, Swift-BAT refined analysis
  86. GRB 090807, RIMOTS optical upper limits
  87. GRB 090726: optical observation
  88. Swift-BAT trigger 358760 is most likely not a GRB
  89. GRB 090717A: Suzaku WAM observation of the prompt emission
  90. GRB 090709A : Quick look analysis of the Suzaku observation
  91. GRB 090728: Swift-BAT refined analysis
  92. GRB 090727: GRT Optical Observation
  93. GRB 090728: Swift XRT refined analysis
  94. GRB 090727: optical observations
  95. GRB 090726: GRT Optical Observation
  96. GRB 090727: Swift/UVOT Upper Limits
  97. GRB 090728: Swift/UVOT Upper Limits
  98. GRB 090727: I-band observations from 1.23m CAHA
  99. GRB 090728, RIMOTS optical upper limits
  100. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate

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