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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"

20521 results found.

  1. GRB 101011A, GROND upper limits
  2. GRB 101011A: Zadko observatory - Gingin optical observations
  3. GRB 101011A: XRT Refined Analysis
  4. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  5. GRB 101011A: Enhanced Swift-XRT position
  6. GRB 101011A: Swift detection of a burst
  7. GRB101008A, GROND detection of a fading afterglow
  8. GRB 101008A: SAO RAS optical observations
  9. GRB 100915 optical upper limit
  10. GRB 101008: Swift/UVOT Upper Limits
  11. GRB 101008A: Enhanced Swift-XRT position
  12. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  13. Swift Trigger 435520 is probably not a GRB
  14. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  15. GRB 100925A / MAXI J1659-152: SARA-S Observations
  16. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  17. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  18. GRB 100925A/MAXI J1659-152 - NOT optical observations
  19. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  20. GRB 100924A: GROND detection of an optical/NIR afterglow
  21. GRB 100925A: Swift detection of a burst
  22. GRB 100924A: Swift-BAT refined analysis
  23. GRB 100917A: TAROT La Silla observatory optical observations
  24. GRB 100915A: TAROT Calern observatory optical observations
  25. GRB100906A: Ashra-1 observation of early optical emission
  26. GRB 100917A: Swift detection of a burst
  27. GRB100915A: MITSuME Ishigakijima Optical upper limits
  28. GRB 100915B: GRT Optical Observation
  29. GRB 100915A: GRT Optical Observation
  30. GRB 100915A: Swift/UVOT Upper Limits
  31. GRB 100915A: Enhanced Swift-XRT position
  32. GRB 100915B: a long GRB detected by INTEGRAL
  33. GRB 100915A: Swift detection of a likely burst
  34. GRB 100910A: Fermi GBM detection
  35. Swift BAT Trigger 433953 probably not a GRB
  36. GRB100909A: MITSuME Ishigakijima Optical upper limits
  37. GRB 100909A: Swift/UVOT observations
  38. GRB 100901A: errata of GRB name in GCN 11270
  39. GRB100909A: NOT optical afterglow confirmation
  40. GRB 100909A: Swift-XRT refined analysis
  41. GRB 100906A: optical observations at Mt.Terskol
  42. GRB 100901A: optical observation in Maidanak, break confirmation
  43. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  44. GRB 100909A: Swift target of opportunity observation
  45. GRB100906A: detection at 15GHz
  46. GRB100901A: IAO optical upper limits at 4 days after the burst
  47. EVLA detection of radio afterglow of GRB100901A
  48. GRB100906A: R band observations
  49. GRB100906A: non-detection at 15GHz
  50. GRB100906A: Optical observations at IAO
  51. GRB 100906A: Enhanced Swift-XRT position
  52. GRB 100906A: Swift/UVOT Observations
  53. GRB100906A: MITSuME Okayama Optical Observation
  54. GRB 100905A: Swift/UVOT Upper Limits
  55. GRB 100901A: TLS observations, SDSS calibration, decay slope
  56. GRB 100906A: MASTER preliminary prompt+afterglow lc
  57. GRB 100906A: Swift detection of a burst with an optical afterglow
  58. GRB 100829A: MASTER optical observations
  59. GRB100905A: Optical upper limits at IAO
  60. GRB100905A: MITSuME Okayama optical upper limits
  61. GRB 100901A: Possible WSRT Radio Detection
  62. GRB100905A: 1.5m OSN upper limit
  63. GRB 100905A: Enhanced Swift-XRT position
  64. GRB 100905A: Swift detection of a burst
  65. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  66. GRB 100901A: Submm observations from SMA
  67. GRB 100902A: GROND observations; afterglow candidate
  68. GRB100902A: Optical upper limits at IAO
  69. GRB10901A: Optical observations at IAO
  70. IPN Triangulation of the very bright GRB 100829A
  71. GRB 100902A: Swift/UVOT Upper Limits
  72. GRB 100902A: optical observation at Mt.Terskol
  73. GRB 100901A: optical observation at Mt.Terskol
  74. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  75. GRB 100902A: Enhanced Swift-XRT position
  76. GRB 100901A: ISON-NM optical observations
  77. GRB 100902A: Swift detection of a burst
  78. GRB 100901A: Vega telescope optical afterglow observation
  79. Swift/UVOT Observations of GRB100901A
  80. GRB 100901A: SARA-N observations
  81. GRB100901A: MITSuME Okayama Optical Observation
  82. GRB 100901A - NOT optical observation
  83. GRB 100901A: Enhanced Swift-XRT position
  84. GRB 100901A: Swift detection of a burst with an optical afterglow
  85. Konus-Wind observation of GRB 100826A
  86. GRB 100829.9: MASTER Optical Limits
  87. GRB 100823A: optical upper limit
  88. GRB 100814A: Maidanak optical observations
  89. GRB 100823A: optical observations
  90. GRB 100823A: MAXI/GSC detection
  91. GRB 100725B: Mondy optical upper limit
  92. GRB 100725B: Maidanak optical upper limit
  93. GRB100807A: R band observations
  94. GRB 100823A: Swift XRT refined analysis
  95. GRB 100823A - second epoch WHT observations
  96. GRB 100823A: TNG NIR observations
  97. GRB 100823A: Swift/UVOT Upper Limits
  98. GRB 100823A: WHT observations
  99. GRB 100823A: Enhanced Swift-XRT position
  100. GRB 100823A: Swift detection of a burst

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