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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"

19593 results found.

  1. GRB 100906A: Swift detection of a burst with an optical afterglow
  2. GRB 100829A: MASTER optical observations
  3. GRB100905A: Optical upper limits at IAO
  4. GRB100905A: MITSuME Okayama optical upper limits
  5. GRB100905A: 1.5m OSN upper limit
  6. GRB 100905A: Enhanced Swift-XRT position
  7. GRB 100905A: Swift detection of a burst
  8. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  9. GRB 100901A: Submm observations from SMA
  10. GRB100902A: Optical upper limits at IAO
  11. GRB10901A: Optical observations at IAO
  12. IPN Triangulation of the very bright GRB 100829A
  13. GRB 100902A: Swift XRT refined analysis
  14. GRB 100902A: Swift/UVOT Upper Limits
  15. GRB 100902A: optical observation at Mt.Terskol
  16. GRB 100901A: optical observation at Mt.Terskol
  17. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  18. GRB 100902A: Enhanced Swift-XRT position
  19. GRB 100901A: ISON-NM optical observations
  20. GRB 100902A: Swift detection of a burst
  21. GRB 100901A: Vega telescope optical afterglow observation
  22. Swift/UVOT Observations of GRB100901A
  23. GRB 100901A: SARA-N observations
  24. GRB100901A: MITSuME Okayama Optical Observation
  25. GRB 100901A - NOT optical observation
  26. GRB 100901A: Enhanced Swift-XRT position
  27. GRB 100901A: Gemini-N Redshift
  28. GRB 100901A: Swift detection of a burst with an optical afterglow
  29. GRB 100829.9: MASTER Optical Limits
  30. GRB 100823A: optical upper limit
  31. GRB 100814A: Maidanak optical observations
  32. GRB 100823A: optical observations
  33. GRB 100823A: MAXI/GSC detection
  34. GRB 100725B: Mondy optical upper limit
  35. GRB 100725B: Maidanak optical upper limit
  36. GRB100807A: R band observations
  37. GRB 100823A: Candidate IR afterglow
  38. GRB 100823A: Swift XRT refined analysis
  39. GRB 100823A - second epoch WHT observations
  40. GRB 100823A: TNG NIR observations
  41. GRB 100823A: Swift/UVOT Upper Limits
  42. GRB 100823A: WHT observations
  43. GRB 100823A: Enhanced Swift-XRT position
  44. GRB 100823A: Swift detection of a burst
  45. EVLA radio afterglow detection of GRB 100814A
  46. GRB 100814A: optical observations
  47. GRB100816A: MITSuME optical upper limits
  48. GRB 100814A: NOT optical observations
  49. GRB 100816A: NOT optical observations
  50. GRB 100814A : Lulin optical observation
  51. GRB 100816A : Lulin r'-band observation
  52. GRB 100816A: Swift UVOT Observations
  53. GRB 100816A: 1.23m CAHA optical observations
  54. GRB 100816A: Enhanced Swift-XRT position
  55. GRB 100816A: Gemini-N imaging
  56. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  57. GRB 100816A: TAROT Calern observatory optical detection
  58. GRB 100816A: MASTER Optical Limits
  59. GRB100816A: TNG optical afterglow confirmation.
  60. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  61. GRB 100814A: Submm observations from APEX
  62. Swift/UVOT observations of GRB100814A
  63. GRB 100814A: Enhanced Swift-XRT position
  64. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  65. GRB 100814A: Swift detection of a burst with an optical afterglow
  66. Swift-BAT trigger 431582 likely is IGR J17464-2811
  67. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  68. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  69. GRB 100802A: further NOT observation
  70. GRB 100807A: P200 Infrared Observations
  71. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  72. GRB100807A: optical observation in CrAO
  73. GRB 100805A: optical observation in CrAO
  74. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  75. GRB100807A: MITSuME optical upper limits
  76. GRB 100807A: P60 Optical Afterglow Discovery
  77. GRB 100807A: Swift/UVOT Upper Limits
  78. GRB 100805A: SAO RAS optical observations
  79. GRB 100807A: Enhanced Swift-XRT position
  80. GRB 100807A: Swift detection of a burst
  81. GRB 100805A: IAC80 and 1.5m OSN optical observations
  82. GRB 100805A: Early RAPTOR Observations
  83. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  84. GRB 100802A: WIYN observations
  85. GRB 100805A: IAC80 BVR-band observations
  86. GRB 100805A: Swift-XRT Refined Analysis
  87. GRB 100805A: GRAS 002 optical observations
  88. Trigger 430975: Swift detection of a possible burst
  89. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  90. GRB 100805A: Enhanced Swift-XRT position
  91. GRB 100805A: Further P60 Monitoring
  92. GRB 100805A: P60 Optical Afterglow Candidate
  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: Swift/UVOT Possible Optical Afterglow

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