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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"

20951 results found.

  1. GRB 100901A : HCT optical observations
  2. GRB 100901A: SARA-N observations
  3. GRB 100901A: THO optical observations
  4. GRB 100901A - NOT optical observation
  5. GRB 100901A: optical observation at Mt.Terskol
  6. GRB 100901A: MASTER power low decay
  7. GRB 100901A: Gemini-N Redshift
  8. GRB 100901A: confirmation of the afterglow
  9. GRB 100901A: Faulkes Telescope North afterglow candidate
  10. GRB100826A: Fermi-LAT Observations
  11. GRB 100814A: Maidanak optical observations
  12. GRB 100823A: optical observations
  13. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  14. GRB100807A: R band observations
  15. GRB 100823A: Candidate IR afterglow
  16. GRB 100823A - second epoch WHT observations
  17. GRB 100823A: TNG NIR observations
  18. GRB 100823: 1.5m OSN I-band observations
  19. GRB 100823A: Swift/UVOT Upper Limits
  20. GRB 100823A: WHT observations
  21. GRB 100814A: ISON-NM optical observations
  22. GRB 100814A: optical observations
  23. GRB 100814A : Liverpool Telescope Observations
  24. GRB 100814A: NOT optical observations
  25. GRB 100816A: NOT optical observations
  26. GRB 100816A: Gemini-N spectroscopy
  27. GRB 100816A: Swift UVOT Observations
  28. GRB 100816A: 1.23m CAHA optical observations
  29. GRB 100816A: Gemini-N imaging
  30. GRB 100816A: TAROT Calern observatory optical detection
  31. GRB100816A: TNG optical afterglow confirmation.
  32. Swift/UVOT observations of GRB100814A - title correction to GCN 11097
  33. GRB 100814A: Submm observations from APEX
  34. Swift/UVOT Observations of GRB100814A - a clearer table.
  35. Swift/UVOT observations of GRB100814A
  36. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  37. GRB 100814A: IAC80 R-band observations
  38. GRB100814A: Magellan Echellette Observations
  39. GRB 100814A: Swift UVOT observations of the optical afterglow
  40. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  41. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  42. GRB 100802A: further NOT observation
  43. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  44. GRB 100807A: P200 Infrared Observations
  45. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  46. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  47. GRB 100807A: P60 Optical Afterglow Discovery
  48. GRB 100807A: Swift/UVOT Upper Limits
  49. GRB 100805A: SAO RAS optical observations
  50. GRB 100805A: IAC80 and 1.5m OSN optical observations
  51. GRB 100805A: Xinglong TNT optical observation
  52. GRB 100805A: Early RAPTOR Observations
  53. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  54. GRB 100802A: WIYN observations
  55. GRB 100805A: IAC80 BVR-band observations
  56. GRB 100805A: GRAS 002 optical observations
  57. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  58. GRB 100805A: Liverpool Telescope afterglow observations
  59. GRB 100805A: Further P60 Monitoring
  60. GRB 100805A: P60 Optical Afterglow Candidate
  61. GRB 100713A: second epoch Maidanak optical observation
  62. GRB 100802A: NOT optical observation
  63. GRB 100802A: P60 Observations
  64. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  65. GRB 100802A: Liverpool Telescope observations
  66. GRB 100728B: Swift/UVOT Observations (correction to GCN 11028)
  67. GRB 100728B: Swift/UVOT Observations (correction)
  68. GRB 100728B - NOT optical observation
  69. GRB 100728B: Swift/UVOT Observations
  70. GRB 100728B: Lick Observations
  71. GRB 100728B: Continued KAIT observations
  72. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  73. GRB 100727A: Swift/UVOT Upper Limits
  74. GRB 100728A, Swift-BAT refined analysis
  75. GRB 100728A: Swift/UVOT Upper Limits
  76. GRB 100728B: GROND Detection of the NIR Afterglow
  77. GRB 100728B: Skynet/PROMPT Detections (correction)
  78. GRB 100728A: Skynet/PROMPT Detections
  79. GRB 100727A, Swift-BAT refined analysis
  80. GRB 100725A: GROND upper limits
  81. GRB 100725B: Swift/UVOT Upper Limits
  82. GRB 100725A: Swift/UVOT Upper Limits
  83. GRB100725B: Faulkes Telescope North observations
  84. GRB100725A Faulkes Telescope South observations
  85. GRB 100724A: Swift/BAT spectral lag results
  86. GRB 100724A: Swift/UVOT observations
  87. GRB 100724A: X-shooter redshift
  88. GRB 100724A, GROND detection of an afterglow candidate
  89. GRB 100614A: 10.4-m GTC deep-optical limit
  90. GRB 100718A: MASTER-Net optical prompt and alert observations
  91. GRB 100719A: Swift detection of a burst
  92. GRB 100713A: optical observation in Maidanak
  93. GRB100713A: Swift/UVOT observations
  94. GRB 100713A: GROND upper limits
  95. GRB 100713A: TNG optical observations
  96. GRB 100713A: TELMA and 1.5m OSN optical observations
  97. GRB100713A: Swift X-ray afterglow detection
  98. GRB 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
  99. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  100. GRB 100628A: Chandra observations

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