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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"

45742 results found.

  1. GRB 090831C: Swift detection of a burst
  2. GRB 090831B, RIMOTS optical upper limits
  3. GRB 090831: MAXI GSC detection
  4. GRB 090831B: Swift detection of a possible burst
  5. GRB 090831: Fermi GBM detection
  6. GRB090829: Fermi GBM Detection
  7. Konus-Wind observations of GRB 090827
  8. GRB 090827: Swift XRT and UVOT observations
  9. GRB 090827 Burst discovered in BAT ground analysis
  10. GRB 090826: Fermi GBM detection
  11. GRB 090828: Fermi GBM detection
  12. Fermi Gamma-ray Burst Monitor trigger 273123112 is not a GRB
  13. GRB 090817 - TLS Observations
  14. GRB090817: Keck/LRIS Spectroscopy
  15. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  16. GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
  17. GRB 090823 Correction to BAT position
  18. GRB 090817: No host galaxy, no supernova
  19. Konus-Wind observations of GRB 090823
  20. GRB 090823 Long burst with IPN triangulation and BAT position
  21. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  22. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  23. GRB 090820B: Fermi GBM detection
  24. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  25. GRB 090820: MASTER-Net optical polarization observations
  26. GRB 090820: Fermi GBM Detection of a bright burst.
  27. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  28. GRB 090817: Liverpool Telescope Observations
  29. GRB 090817: optical upper limit
  30. GRB 090817: Confirmation of the X-ray afterglow
  31. GRB 090815C: Swift refined analysis
  32. GRB 090817: Fermi GBM observation
  33. GRB 090817: Swift/UVOT Upper Limits
  34. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  35. GRB 090813: I-band observations from 1.5m OSN telescope
  36. GRB 090817: Swift-XRT observations
  37. GRB 090814A: optical observations
  38. GRB 090813: Suzaku WAM observation of the prompt emission
  39. GRB 090812: Suzaku WAM observation of the prompt emission
  40. GRB 090817: a long GRB localized by INTEGRAL
  41. VLA radio non-detection of GRB 090812
  42. GRB 090815B: Fermi GBM detection
  43. GRB 090815: Fermi GBM detection
  44. GRB 090813: CrAO optical obsevations
  45. GRB 090814B: Confirmation of the X-ray afterglow
  46. GRB090814A: NOT optical follow-ups
  47. GRB 090814B: I-band observations from 1.23m CAHA telescope
  48. GRB 090814B: Swift/UVOT Upper Limits
  49. GRB 090814B: Liverpool Telescope Observations
  50. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  51. GRB 090814C: Fermi GBM detection
  52. GRB 090814B: Swift-XRT detection of a possible afterglow.
  53. GRB 090814A: Swift/UVOT Observations
  54. GRB 090814A: Swift-XRT Team Refined Analysis
  55. GRB 090814A, RIMOTS optical upper limits
  56. GRB 090814A: Swift-BAT refined analysis
  57. GRB 090813: correction to GCN 9787
  58. GRB090814A: VLT spectroscopy
  59. GRB 090814: Enhanced Swift-XRT position
  60. GRB 090814B: a long GRB localized by INTEGRAL
  61. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  62. GRB 090814: Swift detection of a burst
  63. GRB 090813: Fermi GBM observation
  64. Fermi Gamma-ray Burst Monitor trigger 271446248 is not a GRB
  65. GRB 090813: Swift-XRT refined analysis
  66. Fermi Gamma-ray Burst Monitor trigger 271833016 is not a GRB
  67. GRB 090813, Swift-BAT refined analysis
  68. Konus-Wind observations of GRB090813
  69. GRB090813: Swift/UVOT upper limits
  70. GRB 090813: Enhanced Swift-XRT position
  71. GRB 090813: Liverpool Telescope afterglow confirmation
  72. GRB 090813: P60 Optical Afterglow Confirmation
  73. GRB 090813: optical candidate from 1.23m CAHA telescope
  74. GRB 090813: Swift detection of a burst
  75. GRB 090812: WIRO NIR upper limit
  76. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  77. GRB 090812: RAPTOR detections during the burst
  78. GRB 090812: Swift XRT refined analysis
  79. GRB 090812, RIMOTS optical upper limits
  80. GRB 090812 Swift-BAT Refined Analysis
  81. GRB090812: Swift/UVOT observations
  82. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  83. GRB 090812: Enhanced Swift-XRT position
  84. GRB 090812 VLT redshift
  85. GRB 090812: Liverpool Telescope afterglow confirmation
  86. GRB 090812: P60 Confirmation of Optical Afterglow
  87. GRB 090812: Swift detection of a burst with an optical counterpart
  88. GRB 090807B: Fermi GBM detection
  89. GRB 090809: Further NOT optical observations
  90. VLA radio upper limit on GRB 090809
  91. GRB 090621B: MAGIC telescope GeV observation
  92. GRB 090621A: MAGIC telescope GeV observation
  93. GRB 090809: WHT observations
  94. GRB 090809 X-shooter redshift
  95. GRB 090809B: Fermi GBM detection
  96. GRB 090809: Swift-XRT refined analysis
  97. GRB090809: Swift/UVOT observations
  98. GRB 090809: Enhanced Swift-XRT position
  99. GRB 090809: Swift-BAT refined analysis
  100. GRB 090809: afterglow confirmation at the NOT

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