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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"

20515 results found.

  1. GRB101008A, GROND detection of a fading afterglow
  2. GRB 101008A: SAO RAS optical observations
  3. GRB 100915 optical upper limit
  4. GRB 101008: Swift/UVOT Upper Limits
  5. GRB 101008A: Enhanced Swift-XRT position
  6. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  7. Swift Trigger 435520 is probably not a GRB
  8. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  9. GRB 100925A / MAXI J1659-152: SARA-S Observations
  10. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  11. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  12. GRB 100925A/MAXI J1659-152 - NOT optical observations
  13. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  14. GRB 100924A: GROND detection of an optical/NIR afterglow
  15. GRB 100925A: Swift detection of a burst
  16. GRB 100924A: Swift-BAT refined analysis
  17. GRB 100917A: TAROT La Silla observatory optical observations
  18. GRB 100915A: TAROT Calern observatory optical observations
  19. GRB100906A: Ashra-1 observation of early optical emission
  20. GRB 100917A: Swift detection of a burst
  21. GRB100915A: MITSuME Ishigakijima Optical upper limits
  22. GRB 100915B: GRT Optical Observation
  23. GRB 100915A: GRT Optical Observation
  24. GRB 100915A: Swift/UVOT Upper Limits
  25. GRB 100915A: Enhanced Swift-XRT position
  26. GRB 100915B: a long GRB detected by INTEGRAL
  27. GRB 100915A: Swift detection of a likely burst
  28. GRB 100910A: Fermi GBM detection
  29. Swift BAT Trigger 433953 probably not a GRB
  30. GRB100909A: MITSuME Ishigakijima Optical upper limits
  31. GRB 100909A: Swift/UVOT observations
  32. GRB 100901A: errata of GRB name in GCN 11270
  33. GRB100909A: NOT optical afterglow confirmation
  34. GRB 100909A: Swift-XRT refined analysis
  35. GRB 100906A: optical observations at Mt.Terskol
  36. GRB 100901A: optical observation in Maidanak, break confirmation
  37. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  38. GRB 100909A: Swift target of opportunity observation
  39. GRB100906A: detection at 15GHz
  40. GRB100901A: IAO optical upper limits at 4 days after the burst
  41. EVLA detection of radio afterglow of GRB100901A
  42. GRB100906A: R band observations
  43. GRB100906A: non-detection at 15GHz
  44. GRB100906A: Optical observations at IAO
  45. GRB 100906A: Enhanced Swift-XRT position
  46. GRB 100906A: Swift/UVOT Observations
  47. GRB100906A: MITSuME Okayama Optical Observation
  48. GRB 100905A: Swift/UVOT Upper Limits
  49. GRB 100901A: TLS observations, SDSS calibration, decay slope
  50. GRB 100906A: MASTER preliminary prompt+afterglow lc
  51. GRB 100906A: Swift detection of a burst with an optical afterglow
  52. GRB 100829A: MASTER optical observations
  53. GRB100905A: Optical upper limits at IAO
  54. GRB100905A: MITSuME Okayama optical upper limits
  55. GRB 100901A: Possible WSRT Radio Detection
  56. GRB100905A: 1.5m OSN upper limit
  57. GRB 100905A: Enhanced Swift-XRT position
  58. GRB 100905A: Swift detection of a burst
  59. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  60. GRB 100901A: Submm observations from SMA
  61. GRB 100902A: GROND observations; afterglow candidate
  62. GRB100902A: Optical upper limits at IAO
  63. GRB10901A: Optical observations at IAO
  64. IPN Triangulation of the very bright GRB 100829A
  65. GRB 100902A: Swift/UVOT Upper Limits
  66. GRB 100902A: optical observation at Mt.Terskol
  67. GRB 100901A: optical observation at Mt.Terskol
  68. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  69. GRB 100902A: Enhanced Swift-XRT position
  70. GRB 100901A: ISON-NM optical observations
  71. GRB 100902A: Swift detection of a burst
  72. GRB 100901A: Vega telescope optical afterglow observation
  73. Swift/UVOT Observations of GRB100901A
  74. GRB 100901A: SARA-N observations
  75. GRB100901A: MITSuME Okayama Optical Observation
  76. GRB 100901A - NOT optical observation
  77. GRB 100901A: Enhanced Swift-XRT position
  78. GRB 100901A: Swift detection of a burst with an optical afterglow
  79. Konus-Wind observation of GRB 100826A
  80. GRB 100829.9: MASTER Optical Limits
  81. GRB 100823A: optical upper limit
  82. GRB 100814A: Maidanak optical observations
  83. GRB 100823A: optical observations
  84. GRB 100823A: MAXI/GSC detection
  85. GRB 100725B: Mondy optical upper limit
  86. GRB 100725B: Maidanak optical upper limit
  87. GRB100807A: R band observations
  88. GRB 100823A: Swift XRT refined analysis
  89. GRB 100823A - second epoch WHT observations
  90. GRB 100823A: TNG NIR observations
  91. GRB 100823A: Swift/UVOT Upper Limits
  92. GRB 100823A: WHT observations
  93. GRB 100823A: Enhanced Swift-XRT position
  94. GRB 100823A: Swift detection of a burst
  95. EVLA radio afterglow detection of GRB 100814A
  96. GRB 100814A: optical observations
  97. GRB100816A: MITSuME optical upper limits
  98. GRB 100814A: NOT optical observations
  99. GRB 100816A: NOT optical observations
  100. GRB 100814A : Lulin optical observation

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