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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"

36135 results found.

  1. GRB 100901A: Swift-XRT Team refined analysis
  2. GRB 100901A - NOT optical observation
  3. GRB 100901A: Swift-BAT refined analysis
  4. GRB 100901A: optical observation at Mt.Terskol
  5. GRB 100901A: Enhanced Swift-XRT position
  6. GRB 100901A: optical observation at Mt.Terskol
  7. GRB 100901A: MASTER power low decay
  8. GRB 100901A: Gemini-N Redshift
  9. GRB 100901A: MASTER: the OT brightenning
  10. GRB 100901A: confirmation of the afterglow
  11. GRB 100901A: MASTER Optical Early Limits
  12. GRB 100901A: Faulkes Telescope North afterglow candidate
  13. GRB 100901A: Swift detection of a burst with an optical afterglow
  14. Konus-Wind observation of GRB 100826A
  15. GRB 100829.9: MASTER Optical Limits
  16. IPN triangulation of GRB 100826A
  17. GRB100826A: Fermi-LAT Observations
  18. GRB 100823A: optical upper limit
  19. GRB 100814A: Maidanak optical observations
  20. GRB 100823A: optical observations
  21. GRB 100823A: MAXI/GSC detection
  22. GRB 100725B: Mondy optical upper limit
  23. GRB 100725B: Maidanak optical upper limit
  24. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  25. GRB100807A: R band observations
  26. GRB100823A : MOA optical observation
  27. GRB 100823A: Candidate IR afterglow
  28. GRB 100823A: Swift XRT refined analysis
  29. GRB 100823A: VLT/X-Shooter spectroscopy
  30. GRB 100823A - second epoch WHT observations
  31. GRB 100823A: TNG NIR observations
  32. GRB 100823: 1.5m OSN I-band observations
  33. GRB 100823A: Swift/UVOT Upper Limits
  34. GRB 100823A: WHT observations
  35. GRB 100823A: Swift-BAT refined analysis
  36. GRB 100823A: Enhanced Swift-XRT position
  37. GRB 100823A: Swift detection of a burst
  38. GRB 100814A: Suzaku WAM observation of the prompt emission
  39. GRB 100814A: ISON-NM optical observations
  40. IBAS Alert n. 6057 is not due to a GRB
  41. EVLA radio afterglow detection of GRB 100814A
  42. GRB 100814B: Fermi GBM detection
  43. GRB 100814A: optical observations
  44. GRB 100816A: Fermi GBM observation (correction to GCN 11124)
  45. Konus-Wind observation of GRB 100816A
  46. GRB100816A: MITSuME optical upper limits
  47. GRB 100816A: 10.4-m GTC redshift confirmation
  48. GRB 100816A: Fermi GBM observation
  49. GRB 100816A: VLT and Gemini-N revised redshift
  50. GRB 100814A : Liverpool Telescope Observations
  51. GRB 100814A: NOT optical observations
  52. GRB 100816A: NOT optical observations
  53. Konus-Wind observation of GRB 100814A
  54. GRB 100814A : Lulin optical observation
  55. GRB 100816A : Lulin r'-band observation
  56. GRB 100816A: Gemini-N spectroscopy
  57. GRB 100816A: Swift UVOT Observations
  58. GRB100816A Swift-XRT refined analysis
  59. GRB 100816A: Swift-BAT spectral lag results
  60. GRB 100816A: 1.23m CAHA optical observations
  61. GRB 100816A, Swift-BAT refined analysis
  62. GRB 100816A: Enhanced Swift-XRT position
  63. GRB 100816A: Gemini-N imaging
  64. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  65. GRB100814A - interesting UVOT lightcurve.
  66. GRB 100816A: TAROT Calern observatory optical detection
  67. GRB 100816A: MASTER Optical Limits
  68. GRB100816A: TNG optical afterglow confirmation.
  69. GRB 100816A: ROTSE-III Optical Limits
  70. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  71. GRB 100814A: Fermi GBM observation
  72. GRB 100814A: Submm observations from APEX
  73. GRB 100814A: Swift-XRT refined analysis
  74. Swift/UVOT observations of GRB100814A
  75. GRB 100814A, Swift-BAT refined analysis
  76. GRB 100814A: CQUEAN r- and i-band Observation
  77. GRB 100814A: Enhanced Swift-XRT position
  78. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  79. GRB 100814A: IAC80 R-band observations
  80. GRB100814A: Magellan Echellette Observations
  81. GRB 100814A: Swift UVOT observations of the optical afterglow
  82. GRB 100814A: Swift detection of a burst with an optical afterglow
  83. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  84. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  85. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  86. GRB 100802A: further NOT observation
  87. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  88. GRB 100807A: P200 Infrared Observations
  89. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  90. GRB100807A: optical observation in CrAO
  91. GRB 100805A: optical observation in CrAO
  92. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  93. GRB100807A: MITSuME optical upper limits
  94. GRB 100807A: Swift XRT refined analysis
  95. GRB 100807A: P60 Optical Afterglow Discovery
  96. GRB 100807A: Swift/UVOT Upper Limits
  97. GRB 100805A: SAO RAS optical observations
  98. GRB 100807A: Enhanced Swift-XRT position
  99. GRB 100807A: Swift-BAT refined analysis
  100. GRB 100807A: ROTSE-III Optical Limits

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