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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"

5528 results found.

  1. GRB 100628A: Magellan near-IR observations
  2. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  3. GRB 100625A : IRSF/SIRIUS NIR upper limit
  4. GRB 100625A: Gemini candidate afterglow
  5. Konus-Wind observation of GRB 100621A
  6. GRB 100619A: Correction to the Fermi GBM trigger time
  7. GRB 100621A: GROND observation of bright NIR afterglow
  8. GRB 100621A: ROTSE-III Optical Limits
  9. GRB 100621A: Swift detection of a burst
  10. GRB 100619A: Fermi GBM detection
  11. XRF 100616a : MAXI/GSC detection of a probable XRF
  12. GRB 100615A: Swift detection of a burst
  13. GRB 100513A: CrAO optical observations
  14. Konus-Wind observation of GRB 100522A
  15. GRB100522A: Suzaku WAM observation of the prompt emission
  16. GRB 100522A: Fermi GBM observation
  17. GRB 100522A: Swift detection of a burst
  18. GRB 100513A: PAIRITEL NIR afterglow candidate
  19. GRB100503A: Suzaku WAM observation of the prompt emission
  20. GRB 100503A: Fermi GBM detection
  21. GRB 100424A: PAIRITEL NIR Upper Limits
  22. Swift Trigger 420256: BOOTES-2 observations
  23. Swift Trigger 420256: ROTSE-III Optical Limits
  24. GRB100420A: MITSuME optical upper limits
  25. GRB 100414A: GROND Detection of the Optical Afterglow
  26. GRB 100413: xinglong TNT optical upper limit
  27. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  28. Short X-ray Transient detected by MAXI/GSC
  29. GRB 100322A: Suzaku WAM observation of the prompt emission
  30. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  31. GRB100305A: Optical upper limits at IAO
  32. GRB 100305A: PAIRITEL NIR Upper Limits
  33. GRB 100302A: Ondrejov 65cm limit
  34. GRB 100302A: Optical observations at Crni Vrh
  35. GRB 100206A: optical observations in Terskol
  36. GRB 100216A: Swift/UVOT Observations
  37. GRB 100206A: WHT candidate afterglow
  38. GRB 100206A: Pre-explosion imaging and host candidate
  39. GRB 100203A Detected in Ground Analysis of BAT Data
  40. Swift/BAT Detects an Outburst from XTE J1901+014
  41. GRB 091221: Enhanced Swift-XRT position
  42. GRB 091221: UVOT Confirmation of an Optical Afterglow
  43. GRB 091221: ROTSE-III Detection of Optical Counterpart
  44. GRB 091208B: MITSuME Okayama Optical Observation
  45. GRB 091202: Optical and NIR observations
  46. GRB 091127: redshift confirmation with X-shooter
  47. Short X-ray Transient Detection by MAXI/GSC
  48. GRB 091126B: Fermi GBM detection
  49. GRB 091130: MASTER observations
  50. GRB 091127: NOT observations
  51. GRB 091117: Swift XRT refined analysis
  52. GRB 091117: XRT source coincident with a DSS galaxy
  53. GRB 091109B: VLT observations
  54. GRB 091109B: Swift detection of a short burst
  55. GRB 091109: BOOTES-3 observations
  56. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  57. GRB 091029: Swift detection of a burst with an optical counterpart
  58. GRB 091003A: Fermi LAT detection
  59. GRB 091003A: Fermi GBM detection
  60. GRB 090927: Swift XRT refined analysis
  61. GRB 090926B: optical object in error circle
  62. GRB 090926B: MAXI GSC detection
  63. GRB 090926B: Swift XRT refined analysis
  64. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  65. GRB 090912: Swift detection of a burst
  66. GRB 090902B: Faulkes Telescope North observations
  67. GRB 090831B: MITSuME optical upper limits
  68. GRB 090831B, RIMOTS optical upper limits
  69. GRB 090831B: Swift detection of a possible burst
  70. Fermi Gamma-ray Burst Monitor trigger 273123112 is not a GRB
  71. GRB 090814B: Liverpool Telescope Observations
  72. GRB 090814A, RIMOTS optical upper limits
  73. GRB 090813: Liverpool Telescope afterglow confirmation
  74. GRB 090813: P60 Optical Afterglow Confirmation
  75. GRB 090812: Liverpool Telescope afterglow confirmation
  76. GRB 090812: Swift detection of a burst with an optical counterpart
  77. GRB 090809 X-shooter redshift
  78. GRB 090807: MITSuME optical upper limit
  79. GRB 090807: Swift detection of a burst
  80. GRB 090726: GRT Optical Observation
  81. GRB 090727: I-band observations from 1.23m CAHA
  82. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  83. GRB 090727: Liverpool Telescope possible OT candidate
  84. Fermi Gamma-ray Burst Monitor triggers 269935914 through 270021937 are not GRBs
  85. Konus-Wind and Konus-RF observations of GRB 090715B
  86. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  87. GRB 090712: Fermi GBM observation
  88. GRB 090712: Swift detection of a burst
  89. GRB 090708 : Fermi GBM detection
  90. GRB 090708: Early RAPTOR Optical Limits
  91. GRB 090708: ROTSE-III Optical Limits
  92. GRB 090708: Swift detection of a burst
  93. GRB 090703: Fermi GBM detection
  94. GRB 090313: optical observations
  95. GRB 090626: IPN localization
  96. GRB 090625B: GROND upper limits
  97. GRB 090618: RTT150 optical observations
  98. GRB090618: OAA-OAUV Optical observations
  99. GRB 090616: Fermi GBM detection
  100. RXTE Discovery of Pulsations from SGR 0418+5729

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