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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"

28287 results found.

  1. GRB 100615A: HST host detection and X-shooter redshift
  2. GRB 130305A: Swift/XRT detection of the afterglow
  3. GRB 130305A: Fermi GBM observation
  4. GRB 130305A: Fermi LAT Detection
  5. GRB 121128A: optical upper limit in Maidanak observatory
  6. GRB 130216A: Swift/UVOT Upper Limit
  7. GRB 130219A: Suzaku WAM observation of the prompt emission
  8. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  9. Trigger 549841: Swift detection of SGR1806-20
  10. GRB 130216B: Suzaku WAM observation of the prompt emission
  11. GRB 130216A: possible radio counterpart is steady field source
  12. IPN Triangulation of GRB 130219A
  13. GRB 130215A: Suzaku WAM observation of the prompt emission
  14. GRB 130215A: PTF P48 optical detection
  15. GRB 130219A: Fermi GBM detection
  16. GRB 130216A: Further Swift-BAT refined analysis
  17. GRB 130216B: MASTER-Net early observation
  18. GRB 130216A: MASTER-Net early observations
  19. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  20. GRB 130216A: Fermi GBM observation
  21. GRB 130216B: Fermi GBM observation
  22. GRB 130216A: MITSuME Ishigakijima upper limits
  23. GRB 130216B BAT refined analysis
  24. GRB 130216B: P200 NIR Observations
  25. GRB 130216A: P200 NIR Observations
  26. GRB 130216A: Swift-BAT refined analysis
  27. GRB 130216A: TAROT La Silla observatory optical observations
  28. GRB 130215A: Additional P200 NIR observations
  29. GRB 120118B: host observations and redshift determination
  30. GRB 130215A: P200 NIR observations
  31. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  32. GRB 130215A: MITSuME Okayama Optical Observation
  33. GRB 130215A: Fermi GBM detection
  34. GRB 130215A: RAPTOR Measurements
  35. GRB 130215A: GMG optical observation
  36. GRB 130215A: Xinglong optical observations
  37. GRB 130215A: Swift-BAT refined analysis
  38. GRB 130215A: TAROT La Silla observatory optical observations
  39. GRB 130215A: RATIR Optical and NIR Observations
  40. GRB 130215A: REM NIR observations
  41. GRB 130215A: P60 Observations
  42. GRB 130215A: Redshift estimate
  43. Skynet Observations of GRB130215
  44. GRB 130215: ROTSE-III Detection of Optical Counterpart
  45. GRB 130215A: Swift detection of a burst
  46. GRB 130131B: CTIO 0.9-m optical upper-limits
  47. GRB 121128A: optical observations
  48. GRB 121123A: optical observations
  49. GRB 130211A: Swift/UVOT Upper Limits
  50. GRB 130211A: Swift-XRT refined Analysis
  51. GRB 130211A: Swift-BAT refined analysis
  52. GRB 130211A: GROND detection of the afterglow
  53. GRB 130211A: Swift detection of a burst
  54. GRB 130206A: GROND Observations
  55. GRB 130206A: Fermi LAT Observations
  56. GRB 130206A: Fermi GBM observation
  57. GRB 130206A: XRT and UVOT follow-up observations.
  58. GRB 130131B: optical upper limit in Mondy observatory
  59. GRB 130206A, Swift-BAT refined analysis
  60. GRB 130206A: Zadko observatory - Gingin optical observations
  61. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  62. GRB 130206A: Swift-XRT observations
  63. GRB 130131A: optical observation in Mondy observatory
  64. GRB 130131A: Swift/UVOT Upper Limits
  65. GRB 130131B: RATIR Upper Limits
  66. GRB 130131A: RATIR optical and infrared upper limits
  67. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  68. GRB 130131B: Swift-XRT refined Analysis
  69. GRB 130131A - UKIRT confirmation of afterglow
  70. GRB 130131B: VLT/X-shooter acquisition camera limits
  71. GRB 130131B: GROND Upper limits
  72. GRB 130131B: Swift/UVOT Upper Limits
  73. GRB 130131A: Swift-XRT refined Analysis
  74. GRB 130131B: MITSuME Okayama optical upper limits
  75. GRB 130131A: MITSuME Okayama optical upper limits
  76. GRB 130131B: Enhanced Swift-XRT position
  77. GRB 130131B: Swift-BAT refined analysis
  78. GRB 130131A: Swift-BAT refined analysis
  79. GRB 130131B: TAROT Calern observatory optical observations
  80. GRB 130131B: Zadko observatory - Gingin optical observations
  81. GRB 130131A: Enhanced Swift-XRT position
  82. GRB 130131B: Swift detection of a burst
  83. GRB 130131A - Faulkes Telescope North Observations
  84. GRB 130131A - UKIRT afterglow candidate
  85. GRB 130131A: Swift detection of a burst
  86. GRB 130127A: Fermi GBM detection
  87. Swift Trigger 547142: MAXI/GSC upper limit
  88. GRB 130122A: RTT150 optical observations
  89. GRB 130122A: Swift/UVOT Detection
  90. GRB 130122A: optical observations
  91. GRB 130122A: RATIR Detection
  92. GRB 130122A: Swift-BAT refined analysis
  93. GRB 130122A: Swift-XRT refined Analysis
  94. GRB 130122A: Xinglong optical upper limit
  95. GRB 130122A: Enhanced Swift-XRT position
  96. GRB 130122A: T100 observations
  97. GRB 130122A: Swift detection of a burst with an optical counterpart
  98. Short GRB 121226A: TNG observation of the host galaxy
  99. GRB 121225B: Suzaku WAM observation of the prompt emission
  100. GRB 130102B: MASTER synchronous observations

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