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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"

25641 results found.

  1. GRB 121128A: optical observations in Mondy observatory
  2. GRB 130216A: Swift/UVOT Upper Limit
  3. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  4. Trigger 549841: Swift detection of SGR1806-20
  5. GRB 130216A: possible radio counterpart is steady field source
  6. GRB 130216A: Swift/XRT observations
  7. IPN Triangulation of GRB 130219A
  8. GRB 130215A: PTF P48 optical detection
  9. GRB 130219A: Fermi GBM detection
  10. GRB 130216B: Swift/XRT observations
  11. GRB 130216A: Further Swift-BAT refined analysis
  12. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  13. GRB 130216A: Fermi GBM observation
  14. GRB 130216B: Fermi GBM observation
  15. GRB 130216A: possible early detection at 15 GHz
  16. GRB 130216A: MITSuME Ishigakijima upper limits
  17. GRB 130216B BAT refined analysis
  18. GRB 130216B: P200 NIR Observations
  19. GRB 130216A: P200 NIR Observations
  20. GRB 130216A: Swift-BAT refined analysis
  21. GRB 130216A: TAROT La Silla observatory optical observations
  22. GRB 130216B: Burst found in ground analysis of BAT data
  23. GRB 130216A: OSN I-band observations
  24. GRB 130216A: Swift detection of a burst
  25. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  26. GRB 130215A: Fermi GBM detection
  27. GRB 130215A: RAPTOR Measurements
  28. GRB 130215A: Xinglong optical observations
  29. GRB 130215A: Swift-BAT refined analysis
  30. GRB 130215A: TAROT La Silla observatory optical observations
  31. GRB 130215A: RATIR Optical and NIR Observations
  32. GRB 130215A: P60 Observations
  33. GRB 130215A: ROTSE-III data analysis
  34. GRB 130215A: Redshift estimate
  35. Skynet Observations of GRB130215
  36. GRB 130215: ROTSE-III Detection of Optical Counterpart
  37. GRB 130215A: Swift detection of a burst
  38. Swift GRB130206A: late XRT observations.
  39. GRB 130131B: CTIO 0.9-m optical upper-limits
  40. GRB 130211A: Swift/UVOT Upper Limits
  41. GRB 130211A: Swift-XRT refined Analysis
  42. GRB 130211A: Swift-BAT refined analysis
  43. GRB 130211A: GROND detection of the afterglow
  44. GRB 130211A: Swift detection of a burst
  45. GRB 130122A: PTF P48 optical upper limits
  46. GRB 130206A: GROND Observations
  47. GRB 130206A: Fermi LAT Observations
  48. GRB 130206A: Fermi GBM observation
  49. GRB 130206A: XRT and UVOT follow-up observations.
  50. GRB 130206A, Swift-BAT refined analysis
  51. GRB 130206A: Zadko observatory - Gingin optical observations
  52. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  53. GRB 130206A: Swift-XRT observations
  54. GRB 130131A: optical observation in Mondy observatory
  55. GRB 130206A: Swift detection of a burst
  56. GRB 130131A: Swift/UVOT Upper Limits
  57. GRB 130131B: RATIR Upper Limits
  58. GRB 130131A: RATIR optical and infrared upper limits
  59. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  60. GRB 130131B: Swift-XRT refined Analysis
  61. GRB 130131B: GROND Upper limits
  62. GRB 130131B: Swift/UVOT Upper Limits
  63. GRB 130131A: Swift-XRT refined Analysis
  64. GRB 130131B: Swift-BAT refined analysis
  65. GRB 130131A: Swift-BAT refined analysis
  66. GRB 130131B: TAROT Calern observatory optical observations
  67. GRB 130131B: Zadko observatory - Gingin optical observations
  68. GRB 130131B: Swift detection of a burst
  69. GRB 130131A - Faulkes Telescope North Observations
  70. GRB 130131A - UKIRT afterglow candidate
  71. GRB 130131A: Swift detection of a burst
  72. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  73. GRB 130127A: Fermi GBM detection
  74. Swift Trigger 547142: MAXI/GSC upper limit
  75. Swift Trigger 547142: a probable Galactic source
  76. GRB 130122A: Swift/UVOT Detection
  77. GRB 130122A: RATIR Detection
  78. GRB 130122A: Swift-BAT refined analysis
  79. GRB 130122A: Swift-XRT refined Analysis
  80. GRB 130122A: Xinglong optical upper limit
  81. GRB 130122A: T100 observations
  82. GRB 130122A: Swift detection of a burst with an optical counterpart
  83. GRB 130102B: MASTER synchronous observations
  84. GRB 130102A: Swift/UVOT Upper Limits
  85. GRB 130102A: P60 Observations
  86. GRB 130102A: Swift-BAT refined analysis
  87. GRB 130102A: Swift-XRT refined Analysis
  88. GRB 130102A: Swift detection of a burst
  89. Swift Trigger 544381 is a noise event
  90. GRB 121229A: Swift-XRT refined Analysis
  91. GRB 121229A, Swift-BAT refined analysis
  92. GRB 121229A: Swift/UVOT Upper Limits
  93. GRB 121229A: VLT/X-shooter redshift
  94. Swift Trigger 544381 is unlikely to be a GRB
  95. GRB 121229A: MAXI/GSC detection
  96. GRB 121229A: GROND detection of the afterglow
  97. GRB 121229A: Swift detection of a burst
  98. GRB 121226A: Swift/UVOT Upper Limits
  99. GRB 121226A: Swift-XRT refined Analysis
  100. GRB 121226A, Swift-BAT refined analysis

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