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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"

20365 results found.

  1. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  2. GRB 101123A: MASTER prompt optical observations
  3. Konus-Wind observation of GRB 101123A
  4. GRB 101123A: Fermi GBM detection
  5. GRB 101117B: GROND Upper limits
  6. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  7. XRF 101117A: Palomar Transient Factory Observations
  8. GRB101114A: Swift/UVOT Upper Limits
  9. GRB 101117B: Enhanced Swift-XRT position
  10. GRB 101117B: Swift detection of a burst
  11. XRF101117A: MAXI/GSC detection of a short X-ray transient
  12. GRB 101114A: GROND Upper limits
  13. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  14. GRB 101112A: optical observations
  15. GRB 101112A - XRT source detection/analysis
  16. GRB 101030A : MOA optical observation
  17. GRB 101030A: GROND optical/NIR afterglow candidate
  18. GRB 101030A: Swift/UVOT Upper Limits
  19. GRB 101030A: Enhanced Swift-XRT position
  20. GRB 101030A: Swift detection of a burst
  21. GRB 090111, the review of the sky area in plate archives (1976-1996)
  22. GRB 101024A: GROND optical/NIR observations
  23. GRB 101024A: Zadko observatory - Gingin. Optical observations
  24. GRB101024A: Swift/UVOT
  25. GRB 101024A: Swift-BAT refined analysis
  26. GRB 101024A: Enhanced Swift-XRT position
  27. Swift/UVOT observations of GRB101023A
  28. GRB 101024A: Swift detection of a burst with an optical afterglow
  29. GGRB 101023A: GROND detection of the optical-NIR afterglow
  30. GRB 101023A: Gemini discovery of optical afterglow
  31. GRB 101023A: Enhanced Swift-XRT position
  32. GRB 101023A: REM NIR observations
  33. GRB 101023A: Swift detection of a burst
  34. GRB 101020A, Swift-BAT refined analysis
  35. GRB 101017A: Swift XRT refined analysis
  36. GRB 101017A: Swift/UVOT Observations
  37. GRB 101008A: optical observations
  38. GRB101017A: MITSuME Okayama optical upper limits
  39. GRB 101017A: Enhanced Swift-XRT position
  40. GRB 101017A: Swift detection of a burst with optical counterpart
  41. Konus-Wind observation of GRB 101014A
  42. GRB 100906A: D50 optical detection
  43. GRB 100902A: D50 optical limit
  44. GRB 101011A: Swift/UVOT observations
  45. GRB 101011A, GROND upper limits
  46. GRB 101011A: Zadko observatory - Gingin optical observations
  47. GRB 101011A: XRT Refined Analysis
  48. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  49. GRB 101011A: Enhanced Swift-XRT position
  50. GRB 101011A: Swift detection of a burst
  51. GRB101008A, GROND detection of a fading afterglow
  52. GRB 101008A: SAO RAS optical observations
  53. GRB 100915 optical upper limit
  54. GRB 101008: Swift/UVOT Upper Limits
  55. GRB 101008A: Enhanced Swift-XRT position
  56. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  57. Swift Trigger 435520 is probably not a GRB
  58. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  59. GRB 100925A / MAXI J1659-152: SARA-S Observations
  60. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  61. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  62. GRB 100925A/MAXI J1659-152 - NOT optical observations
  63. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  64. GRB 100924A: GROND detection of an optical/NIR afterglow
  65. GRB 100925A: Swift detection of a burst
  66. GRB 100924A: Swift-BAT refined analysis
  67. GRB 100917A: TAROT La Silla observatory optical observations
  68. GRB 100915A: TAROT Calern observatory optical observations
  69. GRB100906A: Ashra-1 observation of early optical emission
  70. GRB 100917A: Swift detection of a burst
  71. GRB100915A: MITSuME Ishigakijima Optical upper limits
  72. GRB 100915B: GRT Optical Observation
  73. GRB 100915A: GRT Optical Observation
  74. GRB 100915A: Swift/UVOT Upper Limits
  75. GRB 100915A: Enhanced Swift-XRT position
  76. GRB 100915B: a long GRB detected by INTEGRAL
  77. GRB 100915A: Swift detection of a likely burst
  78. GRB 100910A: Fermi GBM detection
  79. Swift BAT Trigger 433953 probably not a GRB
  80. GRB100909A: MITSuME Ishigakijima Optical upper limits
  81. GRB 100909A: Swift/UVOT observations
  82. GRB 100901A: errata of GRB name in GCN 11270
  83. GRB100909A: NOT optical afterglow confirmation
  84. GRB 100909A: Swift-XRT refined analysis
  85. GRB 100906A: optical observations at Mt.Terskol
  86. GRB 100901A: optical observation in Maidanak, break confirmation
  87. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  88. GRB 100909A: Swift target of opportunity observation
  89. GRB100906A: detection at 15GHz
  90. GRB100901A: IAO optical upper limits at 4 days after the burst
  91. EVLA detection of radio afterglow of GRB100901A
  92. GRB100906A: R band observations
  93. GRB100906A: non-detection at 15GHz
  94. GRB100906A: Optical observations at IAO
  95. GRB 100906A: Enhanced Swift-XRT position
  96. GRB 100906A: Swift/UVOT Observations
  97. GRB100906A: MITSuME Okayama Optical Observation
  98. GRB 100905A: Swift/UVOT Upper Limits
  99. GRB 100901A: TLS observations, SDSS calibration, decay slope
  100. GRB 100906A: MASTER preliminary prompt+afterglow lc

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