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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"

26767 results found.

  1. GRB 130306A: Swift Detection of a Possible Afterglow
  2. GRB 130310A: Fermi GBM detection
  3. GRB 130310A: Fermi-LAT detection and localization
  4. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  5. GRB 130306A: MITSuME Ishigakijima upper limits
  6. GRB 130306A: Swift-BAT refined analysis
  7. IPN triangulation of GRB 130228A
  8. GRB 130305A BAT refined circular
  9. GRB 130305A: Further Swift-XRT Observations
  10. Konus-Wind observation of GRB 130306A
  11. GRB 130305A: Optical Observations
  12. GRB 130307A: Fermi GBM detection
  13. GRB 130306A: Fermi GBM observation
  14. GRB 130306A: MASTER-Net pre-Swift alert observation
  15. GRB 130305A: Swift/UVOT Upper Limit
  16. GRB 130305A: RATIR Observations
  17. GRB 130306A: Swift detection of a burst
  18. GRB 130305A: P60 Observations
  19. GRB 100615A: HST host detection and X-shooter redshift
  20. GRB 130305A: Swift/XRT detection of the afterglow
  21. Konus-Wind observation of GRB 130305A
  22. GRB 130305A: Fermi GBM observation
  23. GRB 130305A: Fermi LAT Detection
  24. Fermi GBM trigger 130301.638 is not GRB
  25. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  26. GRB 130305A found in ground analysis of Swift/BAT data
  27. GRB 121128A: optical observations in Mondy observatory
  28. GRB 130216A: Swift/UVOT Upper Limit
  29. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  30. Trigger 549841: Swift detection of SGR1806-20
  31. GRB 130216A: possible radio counterpart is steady field source
  32. GRB 130216A: Swift/XRT observations
  33. IPN Triangulation of GRB 130219A
  34. GRB 130215A: PTF P48 optical detection
  35. GRB 130219A: Fermi GBM detection
  36. GRB 130216B: Swift/XRT observations
  37. GRB 130216A: Further Swift-BAT refined analysis
  38. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  39. GRB 130216A: Fermi GBM observation
  40. GRB 130216B: Fermi GBM observation
  41. GRB 130216A: possible early detection at 15 GHz
  42. GRB 130216A: MITSuME Ishigakijima upper limits
  43. GRB 130216B BAT refined analysis
  44. GRB 130216B: P200 NIR Observations
  45. GRB 130216A: P200 NIR Observations
  46. GRB 130216A: Swift-BAT refined analysis
  47. GRB 130216A: TAROT La Silla observatory optical observations
  48. GRB 130216B: Burst found in ground analysis of BAT data
  49. GRB 130216A: OSN I-band observations
  50. GRB 130216A: Swift detection of a burst
  51. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  52. GRB 130215A: Fermi GBM detection
  53. GRB 130215A: RAPTOR Measurements
  54. GRB 130215A: Xinglong optical observations
  55. GRB 130215A: Swift-BAT refined analysis
  56. GRB 130215A: TAROT La Silla observatory optical observations
  57. GRB 130215A: RATIR Optical and NIR Observations
  58. GRB 130215A: P60 Observations
  59. GRB 130215A: ROTSE-III data analysis
  60. GRB 130215A: Redshift estimate
  61. Skynet Observations of GRB130215
  62. GRB 130215: ROTSE-III Detection of Optical Counterpart
  63. GRB 130215A: Swift detection of a burst
  64. Swift GRB130206A: late XRT observations.
  65. GRB 130131B: CTIO 0.9-m optical upper-limits
  66. GRB 130211A: Swift/UVOT Upper Limits
  67. GRB 130211A: Swift-XRT refined Analysis
  68. GRB 130211A: Swift-BAT refined analysis
  69. GRB 130211A: GROND detection of the afterglow
  70. GRB 130211A: Swift detection of a burst
  71. GRB 130122A: PTF P48 optical upper limits
  72. GRB 130206A: GROND Observations
  73. GRB 130206A: Fermi LAT Observations
  74. GRB 130206A: Fermi GBM observation
  75. GRB 130206A: XRT and UVOT follow-up observations.
  76. GRB 130206A, Swift-BAT refined analysis
  77. GRB 130206A: Zadko observatory - Gingin optical observations
  78. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  79. GRB 130206A: Swift-XRT observations
  80. GRB 130131A: optical observation in Mondy observatory
  81. GRB 130206A: Swift detection of a burst
  82. GRB 130131A: Swift/UVOT Upper Limits
  83. GRB 130131B: RATIR Upper Limits
  84. GRB 130131A: RATIR optical and infrared upper limits
  85. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  86. GRB 130131B: Swift-XRT refined Analysis
  87. GRB 130131B: GROND Upper limits
  88. GRB 130131B: Swift/UVOT Upper Limits
  89. GRB 130131A: Swift-XRT refined Analysis
  90. GRB 130131B: Swift-BAT refined analysis
  91. GRB 130131A: Swift-BAT refined analysis
  92. GRB 130131B: TAROT Calern observatory optical observations
  93. GRB 130131B: Zadko observatory - Gingin optical observations
  94. GRB 130131B: Swift detection of a burst
  95. GRB 130131A - Faulkes Telescope North Observations
  96. GRB 130131A - UKIRT afterglow candidate
  97. GRB 130131A: Swift detection of a burst
  98. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  99. GRB 130127A: Fermi GBM detection
  100. Swift Trigger 547142: MAXI/GSC upper limit

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