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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"

28124 results found.

  1. GRB 100901A : HCT optical observations
  2. GRB 100901A: SARA-N observations
  3. GRB 100901A: THO optical observations
  4. GRB100901A: MITSuME Okayama Optical Observation
  5. GRB 100901A: Swift-XRT Team refined analysis
  6. GRB 100901A - NOT optical observation
  7. GRB 100901A: optical observation at Mt.Terskol
  8. GRB 100901A: Enhanced Swift-XRT position
  9. GRB 100901A: optical observation at Mt.Terskol
  10. GRB 100901A: Gemini-N Redshift
  11. GRB 100901A: confirmation of the afterglow
  12. GRB 100901A: Faulkes Telescope North afterglow candidate
  13. GRB 100901A: Swift detection of a burst with an optical afterglow
  14. GRB 100823A: optical upper limit
  15. GRB 100814A: Maidanak optical observations
  16. GRB 100823A: MAXI/GSC detection
  17. GRB 100725B: Mondy optical upper limit
  18. GRB 100725B: Maidanak optical upper limit
  19. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  20. GRB100823A : MOA optical observation
  21. GRB 100823A: Candidate IR afterglow
  22. GRB 100823A: Swift XRT refined analysis
  23. GRB 100823A: VLT/X-Shooter spectroscopy
  24. GRB 100823A - second epoch WHT observations
  25. GRB 100823A: TNG NIR observations
  26. GRB 100823: 1.5m OSN I-band observations
  27. GRB 100823A: Swift/UVOT Upper Limits
  28. GRB 100823A: WHT observations
  29. GRB 100823A: Enhanced Swift-XRT position
  30. GRB 100823A: Swift detection of a burst
  31. GRB 100814A: ISON-NM optical observations
  32. EVLA radio afterglow detection of GRB 100814A
  33. GRB 100814B: Fermi GBM detection
  34. GRB 100814A: optical observations
  35. GRB100816A: MITSuME optical upper limits
  36. GRB 100816A: 10.4-m GTC redshift confirmation
  37. GRB 100816A: VLT and Gemini-N revised redshift
  38. GRB 100814A : Liverpool Telescope Observations
  39. GRB 100814A: NOT optical observations
  40. GRB 100816A: NOT optical observations
  41. GRB 100814A : Lulin optical observation
  42. GRB 100816A : Lulin r'-band observation
  43. GRB 100816A: Gemini-N spectroscopy
  44. GRB 100816A: Swift UVOT Observations
  45. GRB100816A Swift-XRT refined analysis
  46. GRB 100816A: 1.23m CAHA optical observations
  47. GRB 100816A: Enhanced Swift-XRT position
  48. GRB 100816A: Gemini-N imaging
  49. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  50. GRB100814A - interesting UVOT lightcurve.
  51. GRB 100816A: TAROT Calern observatory optical detection
  52. GRB100816A: TNG optical afterglow confirmation.
  53. GRB 100816A: ROTSE-III Optical Limits
  54. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  55. GRB 100814A: Submm observations from APEX
  56. GRB 100814A: Swift-XRT refined analysis
  57. Swift/UVOT observations of GRB100814A
  58. GRB 100814A: CQUEAN r- and i-band Observation
  59. GRB 100814A: Enhanced Swift-XRT position
  60. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  61. GRB 100814A: IAC80 R-band observations
  62. GRB100814A: Magellan Echellette Observations
  63. GRB 100814A: Swift UVOT observations of the optical afterglow
  64. GRB 100814A: Swift detection of a burst with an optical afterglow
  65. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  66. Swift-BAT trigger 431582 likely is IGR J17464-2811
  67. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  68. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  69. GRB100807A: optical observation in CrAO
  70. GRB 100805A: optical observation in CrAO
  71. GRB100807A: MITSuME optical upper limits
  72. GRB 100807A: Swift XRT refined analysis
  73. GRB 100807A: P60 Optical Afterglow Discovery
  74. GRB 100807A: Swift/UVOT Upper Limits
  75. GRB 100807A: Enhanced Swift-XRT position
  76. GRB 100807A: ROTSE-III Optical Limits
  77. GRB 100807A: Swift detection of a burst
  78. GRB 100805A: IAC80 and 1.5m OSN optical observations
  79. GRB 100805A: Xinglong TNT optical observation
  80. GRB 100805A: ROTSE-III Optical detection
  81. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  82. GRB 100802A: WIYN observations
  83. GRB 100805A: IAC80 BVR-band observations
  84. GRB 100805A: Swift-XRT Refined Analysis
  85. GRB 100805A: GRAS 002 optical observations
  86. Trigger 430975: Swift detection of a possible burst
  87. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  88. GRB 100805A: Enhanced Swift-XRT position
  89. GRB 100805A: Liverpool Telescope afterglow observations
  90. GRB 100805A: Further P60 Monitoring
  91. GRB 100805A: P60 Optical Afterglow Candidate
  92. GRB 100805A: Enhanced Swift-XRT position
  93. GRB 100805A: Swift detection of a burst with an optical counterpart
  94. GRB 100728B: optical photometry of ISON-NM
  95. GRB 100713A: second epoch Maidanak optical observation
  96. GRB 100713A: CrAO optical limits
  97. GRB 100802A: NOT optical observation
  98. GRB100802A: MITSuME optical upper limits
  99. GRB 100802A: P60 Observations
  100. GRB 100802A: XRT refined analysis

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