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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"

20514 results found.

  1. GRB 101008A: 1.23m CAHA optical observations
  2. GRB 100728B: X-shooter redshift
  3. GRB 100925A / MAXI J1659-152: MASTER optical observations
  4. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  5. GRB 100925A / MAXI J1659-152: SARA-S Observations
  6. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  7. GRB 100925A/MAXI J1659-152 - NOT optical observations
  8. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  9. GRB 100924A: GROND detection of an optical/NIR afterglow
  10. GRB 100917A: TAROT La Silla observatory optical observations
  11. GRB 100915A: TAROT Calern observatory optical observations
  12. GRB 100915A: Swift/UVOT Upper Limits
  13. GRB 100909A: Swift/UVOT observations
  14. GRB 100901A: errata of GRB name in GCN 11270
  15. GRB 100901A: optical observations in Mondy and R-light curve
  16. GRB 100906A: optical observations at Mt.Terskol
  17. GRB 100901A: optical observation in Maidanak, break confirmation
  18. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  19. GRB 100909A: Swift target of opportunity observation
  20. GRB100906A: detection at 15GHz
  21. GRB100901A: IAO optical upper limits at 4 days after the burst
  22. GRB 100901A: Confirmation of WSRT Radio Detection
  23. GRB 100901A: CrAO optical observations
  24. GRB 100906A: RTT150 optical observations
  25. GRB 100906A: GRAS-007 optical observations
  26. GRB100906A: R band observations
  27. GRB100906A: Optical observations at IAO
  28. GRB 100906A: TLS Monitoring
  29. GRB 100901A: TLS Detection at 5.5 days
  30. GRB 100906A: Observations at the Virtual Telescope
  31. GRB 100906A: Swift/UVOT Observations
  32. GRB 100906A: Ondrejov 65cm observations
  33. GRB 100906A: TLS Multicolor Observations
  34. GRB 100905A: Swift/UVOT Upper Limits
  35. GRB 100901A: TLS observations, SDSS calibration, decay slope
  36. GRB 100906A: MASTER preliminary prompt+afterglow lc
  37. GRB 100901A: ISON-NM optical observations
  38. GRB 100906A: Gemini-N/GMOS redshift
  39. GRB 100906A : Faulkes Telescope North optical observations
  40. GRB 100906A: MASTER early OT observations
  41. GRB 100829A: MASTER optical observations
  42. GRB 100901A: Possible WSRT Radio Detection
  43. GRB100904A: BOOTES-3 Upper Limit
  44. GRB 100905A: MASTER Prompt Optical Observations
  45. GRB 100905A: Faulkes Telescope North observations
  46. Optical observations of GRB 100901A
  47. GRB 100901A: Submm observations from SMA
  48. GRB 100902A: GROND observations; afterglow candidate
  49. GRB10901A: Optical observations at IAO
  50. GRB 100901A: optical observation at Mt.Terskol
  51. GRB 100901A: multicolor photometry at Mt.Terskol
  52. GRB 100901A: Lightbuckets Optical Observations
  53. GRB 100901A: HCT optical observations
  54. GRB 100902A: 1.5m OSN I-band Upper Limits
  55. GRB 100902A: Swift/UVOT Upper Limits
  56. GRB 100901A: optical observation at Mt.Terskol
  57. GRB 100901A: TLS Observations: Break?
  58. GRB 100902A: MASTER Prompt Optical Observations
  59. GRB 100901A: ISON-NM optical observations
  60. GRB 100902A: Faulkes Telescope South observations
  61. GRB 100901A: 1.5m OSN BVRI-band observations.
  62. GRB 100901A: MASTER optical flare at 420s discovery
  63. Swift/UVOT Observations of GRB100901A
  64. GRB 100901A : HCT optical observations
  65. GRB 100901A: SARA-N observations
  66. GRB 100901A: THO optical observations
  67. GRB 100901A - NOT optical observation
  68. GRB 100901A: optical observation at Mt.Terskol
  69. GRB 100901A: MASTER power low decay
  70. GRB 100901A: Gemini-N Redshift
  71. GRB 100901A: confirmation of the afterglow
  72. GRB 100901A: Faulkes Telescope North afterglow candidate
  73. GRB100826A: Fermi-LAT Observations
  74. GRB 100814A: Maidanak optical observations
  75. GRB 100823A: optical observations
  76. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  77. GRB100807A: R band observations
  78. GRB 100823A: Candidate IR afterglow
  79. GRB 100823A - second epoch WHT observations
  80. GRB 100823A: TNG NIR observations
  81. GRB 100823: 1.5m OSN I-band observations
  82. GRB 100823A: Swift/UVOT Upper Limits
  83. GRB 100823A: WHT observations
  84. GRB 100814A: ISON-NM optical observations
  85. GRB 100814A: optical observations
  86. GRB 100814A : Liverpool Telescope Observations
  87. GRB 100814A: NOT optical observations
  88. GRB 100816A: NOT optical observations
  89. GRB 100816A: Gemini-N spectroscopy
  90. GRB 100816A: Swift UVOT Observations
  91. GRB 100816A: 1.23m CAHA optical observations
  92. GRB 100816A: Gemini-N imaging
  93. GRB 100816A: TAROT Calern observatory optical detection
  94. GRB100816A: TNG optical afterglow confirmation.
  95. Swift/UVOT observations of GRB100814A - title correction to GCN 11097
  96. GRB 100814A: Submm observations from APEX
  97. Swift/UVOT Observations of GRB100814A - a clearer table.
  98. Swift/UVOT observations of GRB100814A
  99. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  100. GRB 100814A: IAC80 R-band observations

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