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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"

3613 results found.

  1. GRB 110213B: MAXI/GSC detection of a probable GRB
  2. GRB 110212A, Swift-BAT refined analysis
  3. SGR-like outburst from the magnetar 1E 1841-04.5
  4. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  5. GRB 110206A: TAROT La Silla observatory optical observations
  6. GRB 101112A: Maidanak and CrAO optical observations
  7. GRB 110128A: Afterglow detection from NOT
  8. IPN triangulation of GRB 110120A
  9. New feature in Fermi GBM GRB Ground Position Notices
  10. GRB 110106B: MASTER optical observations
  11. Short GRB 110106A: MASTER OT observations
  12. Konus-Wind observation of GRB 110102A
  13. GRB 101225A: MAXI/GSC observations
  14. Trigger 441015 / GRB 101225A: Further NOT optical observation
  15. GRB 101224A, Swift-BAT refined analysis
  16. XRF 101117A, RIMOTS optical upper limits
  17. Swift detection of MAXIJ1409-619
  18. GRB 101123A: Fermi GBM detection
  19. XRF 101117A: Palomar Transient Factory Observations
  20. GRB 101117B: Swift-BAT refined analysis
  21. XRF101117A: MAXI/GSC detection of a short X-ray transient
  22. GRB 101112A: optical observations
  23. GRB 101030A: Swift detection of a burst
  24. Konus-Wind observation of GRB 101023A
  25. GRB 101024A: Swift-BAT refined analysis
  26. GRB 101023A: Swift-BAT refined analysis
  27. GRB 101008A: optical observations
  28. GRB 100925A / MAXI J1659-152: MASTER optical observations
  29. GRB 100924A: Fermi GBM observation
  30. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  31. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  32. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  33. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  34. GRB 100925A / MAXI J1659-152: SARA-S Observations
  35. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  36. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  37. GRB 100925A/MAXI J1659-152 - NOT optical observations
  38. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  39. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  40. GRB 100915A: Swift-BAT refined analysis
  41. GRB100906A: R band observations
  42. GRB 100901A: ISON-NM optical observations
  43. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  44. GRB 100902A: MASTER Prompt Optical Observations
  45. GRB100901A: MITSuME Okayama Optical Observation
  46. GRB 100823A: MAXI/GSC detection
  47. GRB 100816A, Swift-BAT refined analysis
  48. GRB 100814A: CQUEAN r- and i-band Observation
  49. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  50. GRB 100805A: optical observation in CrAO
  51. Trigger 430975: Swift detection of a possible burst
  52. GRB 100725B: Swift-BAT refined analysis
  53. GRB 100725B: Enhanced Swift-XRT position
  54. GRB 100725B: Swift detection of a burst
  55. GRB 100719A: Swift-BAT refined analysis
  56. GRB 100719A: Swift detection of a burst
  57. Konus-Wind observation of GRB 100707A
  58. XRF 100701A : MAXI/GSC detection of a probable XRF
  59. GRB 100628A: Swift-BAT refined analysis
  60. GRB 100625A: Swift detection of a short hard burst
  61. Konus-Wind observation of GRB 100621A
  62. XRF 100616a : MAXI/GSC detection of a probable XRF
  63. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  64. GRB 100513A: CrAO optical observations
  65. GRB 100514A: Faulkes Telescope South observations
  66. GRB 100510A: Fermi GBM detection/observation
  67. GRB 100510A: MAXI/GSC detection
  68. GRB 100420A: Gemini discovery of infrared afterglow
  69. Konus-Wind observation of GRB 100423A
  70. GRB 100424A: CrAO optical observations
  71. GRB 100424A: Gemini/NIRI Candidate Afterglow
  72. GRB 100415A: MAXI/GSC detection of a probable GRB
  73. GRB 100413A: SARA upper limit
  74. Konus-Wind observation of GRB 100324B
  75. Short X-ray Transient detected by MAXI/GSC
  76. GRB 100322A: Suzaku WAM observation of the prompt emission
  77. Swift-BAT refined analysis of the probable new SGR 1833-0832
  78. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  79. GRB 100316C: Swift detection of a burst
  80. GRB 100213B: Swift-BAT refined analysis
  81. GRB 100205A: Swift detection of a burst
  82. Short X-ray Transient detected by MAXI/GSC
  83. Konus-Wind observation of GRB 100103A
  84. GRB091208B: Swift/UVOT refined analysis
  85. GRB 091208B: MITSuME Okayama Optical Observation
  86. GRB 091208B: Swift detection of a burst with an optical afterglow
  87. GRB 091208B: BOOTES-3 optical afterglow
  88. GRB 091208: ROTSE-III Optical Limits
  89. Short X-ray Transient, RIMOTS optical upper limits
  90. Short X-ray Transient Detection by MAXI/GSC
  91. Konus-Wind observation of GRB 091127
  92. GRB 091127: Swift-XRT afterglow detection and analysis
  93. GRB 091127: TAROT La Silla observatory optical decay
  94. GRB 091127: Swift/UVOT observations
  95. GRB 091127: CAHA 1.23m I-band observations
  96. GRB 091127: REM NIR afterglow detection
  97. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  98. GRB 091127: Liverpool Telescope afterglow candidate
  99. GRB 091127: Swift detection of a burst
  100. IPN Triangulation of GRB091120

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