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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"

36148 results found.

  1. GRB 100901A: ISON-NM optical observations
  2. GRB 100902A: Faulkes Telescope South observations
  3. GRB 100902A: MASTER Optical Early Limit
  4. GRB 100902A: Swift detection of a burst
  5. GRB 100901A: 1.5m OSN BVRI-band observations.
  6. GRB 100901A: ROTSE-III Detection
  7. GRB 100901A: MASTER optical flare at 420s discovery
  8. GRB 100901A: Vega telescope optical afterglow observation
  9. Swift/UVOT Observations of GRB100901A
  10. GRB 100901A : HCT optical observations
  11. GRB 100901A: SARA-N observations
  12. GRB 100901A: THO optical observations
  13. GRB100901A: MITSuME Okayama Optical Observation
  14. GRB 100901A: Swift-XRT Team refined analysis
  15. GRB 100901A - NOT optical observation
  16. GRB 100901A: Swift-BAT refined analysis
  17. GRB 100901A: optical observation at Mt.Terskol
  18. GRB 100901A: Enhanced Swift-XRT position
  19. GRB 100901A: optical observation at Mt.Terskol
  20. GRB 100901A: MASTER power low decay
  21. GRB 100901A: Gemini-N Redshift
  22. GRB 100901A: MASTER: the OT brightenning
  23. GRB 100901A: confirmation of the afterglow
  24. GRB 100901A: MASTER Optical Early Limits
  25. GRB 100901A: Faulkes Telescope North afterglow candidate
  26. GRB 100901A: Swift detection of a burst with an optical afterglow
  27. Konus-Wind observation of GRB 100826A
  28. GRB 100829.9: MASTER Optical Limits
  29. IPN triangulation of GRB 100826A
  30. GRB100826A: Fermi-LAT Observations
  31. GRB 100823A: optical upper limit
  32. GRB 100814A: Maidanak optical observations
  33. GRB 100823A: optical observations
  34. GRB 100823A: MAXI/GSC detection
  35. GRB 100725B: Mondy optical upper limit
  36. GRB 100725B: Maidanak optical upper limit
  37. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  38. GRB100807A: R band observations
  39. GRB100823A : MOA optical observation
  40. GRB 100823A: Candidate IR afterglow
  41. GRB 100823A: Swift XRT refined analysis
  42. GRB 100823A: VLT/X-Shooter spectroscopy
  43. GRB 100823A - second epoch WHT observations
  44. GRB 100823A: TNG NIR observations
  45. GRB 100823: 1.5m OSN I-band observations
  46. GRB 100823A: Swift/UVOT Upper Limits
  47. GRB 100823A: WHT observations
  48. GRB 100823A: Swift-BAT refined analysis
  49. GRB 100823A: Enhanced Swift-XRT position
  50. GRB 100823A: Swift detection of a burst
  51. GRB 100814A: Suzaku WAM observation of the prompt emission
  52. GRB 100814A: ISON-NM optical observations
  53. IBAS Alert n. 6057 is not due to a GRB
  54. EVLA radio afterglow detection of GRB 100814A
  55. GRB 100814B: Fermi GBM detection
  56. GRB 100814A: optical observations
  57. GRB 100816A: Fermi GBM observation (correction to GCN 11124)
  58. Konus-Wind observation of GRB 100816A
  59. GRB100816A: MITSuME optical upper limits
  60. GRB 100816A: 10.4-m GTC redshift confirmation
  61. GRB 100816A: Fermi GBM observation
  62. GRB 100816A: VLT and Gemini-N revised redshift
  63. GRB 100814A : Liverpool Telescope Observations
  64. GRB 100814A: NOT optical observations
  65. GRB 100816A: NOT optical observations
  66. Konus-Wind observation of GRB 100814A
  67. GRB 100814A : Lulin optical observation
  68. GRB 100816A : Lulin r'-band observation
  69. GRB 100816A: Gemini-N spectroscopy
  70. GRB 100816A: Swift UVOT Observations
  71. GRB100816A Swift-XRT refined analysis
  72. GRB 100816A: Swift-BAT spectral lag results
  73. GRB 100816A: 1.23m CAHA optical observations
  74. GRB 100816A, Swift-BAT refined analysis
  75. GRB 100816A: Enhanced Swift-XRT position
  76. GRB 100816A: Gemini-N imaging
  77. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  78. GRB100814A - interesting UVOT lightcurve.
  79. GRB 100816A: TAROT Calern observatory optical detection
  80. GRB 100816A: MASTER Optical Limits
  81. GRB100816A: TNG optical afterglow confirmation.
  82. GRB 100816A: ROTSE-III Optical Limits
  83. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  84. GRB 100814A: Fermi GBM observation
  85. GRB 100814A: Submm observations from APEX
  86. GRB 100814A: Swift-XRT refined analysis
  87. Swift/UVOT observations of GRB100814A
  88. GRB 100814A, Swift-BAT refined analysis
  89. GRB 100814A: CQUEAN r- and i-band Observation
  90. GRB 100814A: Enhanced Swift-XRT position
  91. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  92. GRB 100814A: IAC80 R-band observations
  93. GRB100814A: Magellan Echellette Observations
  94. GRB 100814A: Swift UVOT observations of the optical afterglow
  95. GRB 100814A: Swift detection of a burst with an optical afterglow
  96. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  97. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  98. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  99. GRB 100802A: further NOT observation
  100. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening

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