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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"

14950 results found.

  1. GRB 130427A: MAXI/GSC detection
  2. GRB 130427B: Faulkes Telescope North afterglow detection
  3. GRB 130427B: Swift detection of a burst with optical counterpart
  4. GRB 130427A: Faulkes Telescope North detection
  5. GRB 130427A: P60 early detection
  6. GRB 130427A: P60 early nondetection
  7. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  8. Konus-Wind observation of GRB 130425A
  9. IPN Triangulation of GRB 130425A
  10. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  11. GRB 130425A: Fermi GBM detection
  12. Swift Trigger 554135 is probably not a GRB or transient
  13. GRB 130420A: Swift/UVOT Detection
  14. GRB130420B: GMG optical upper limit
  15. GRB 130420A: GMG optical observation
  16. GRB 130420B: Swift detection of a burst
  17. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  18. GRB 130420A: Swift detection of a burst with an optical counterpart
  19. GRB 130418A: Submm observations from SMA
  20. Trigger 553930: Swift detection of a possible flare from HR 5110
  21. GRB 130418A: LOAO Observation
  22. GRB 130419A: Swift detection of a burst
  23. GRB 130418A: CARMA 3mm detection
  24. GRB 130418A: GROND detection of the optical-NIR afterglow
  25. GRB130418A: OSN 1.5m fading afterglow detection
  26. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  27. GRB 130418A: Swift detection of a burst with an optical counterpart
  28. GRB 130408A: GROND detection of the afterglow
  29. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  30. GRB 130408A: Liverpool Telescope Optical candidate detection
  31. GRB 130408A: Swift detection of a burst
  32. GRB 130407A: MAXI/GSC detection
  33. Swift detection of IGR J18245-2452
  34. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  35. Konus-Wind observation of GRB 130327B
  36. GRB 130327B: Fermi-LAT detection of a burst
  37. GRB 130327B: Fermi GBM detection
  38. Swift Trigger 552142: a possible GRB
  39. GRB 130327B: gamma-ray detection by AGILE
  40. Konus-Wind observation of GRB 130325A
  41. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  42. GRB 130325A: Fermi LAT detection
  43. GRB 130327A: Swift detection of a burst
  44. report: GRB 130315A: Zadko observatory - Gingin optical observations
  45. GRB 130325A: Fermi GBM detection
  46. GRB 130315A: SALT optical observations
  47. GRB 130315A: Swift detection of a burst
  48. GRB 130310A : Suzaku WAM observation of the prompt emission
  49. GRB 130305A: TLS Tautenburg observations
  50. GRB 130215A: Detection of the SN with the 10.4m GTC
  51. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  52. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  53. GRB 130313A: Swift detection of a short burst
  54. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  55. Swift XRT RETRACTION of GRB 130310A afterglow detection
  56. GRB 130306A: Swift Detection of a Possible Afterglow
  57. GRB 130131B: host detection and redshift
  58. Konus-Wind observation of GRB 130310A
  59. IPN triangulation of GRB 130310A
  60. GRB 130310A: Fermi GBM detection
  61. GRB 130310A: Fermi-LAT detection and localization
  62. GRB 130305A: Optical Observations
  63. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  64. GRB 130307A: Fermi GBM detection
  65. GRB 130306A: Swift detection of a burst
  66. GRB 100615A: HST host detection and X-shooter redshift
  67. GRB 130305A: Swift/XRT detection of the afterglow
  68. Konus-Wind observation of GRB 130305A
  69. GRB 130305A: Fermi LAT Detection
  70. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  71. Trigger 549841: Swift detection of SGR1806-20
  72. Konus-Wind observation of GRB 130219A
  73. GRB 130215A: PTF P48 optical detection
  74. GRB 130219A: Fermi GBM detection
  75. GRB 130216A: possible early detection at 15 GHz
  76. GRB 130216A: OSN I-band observations
  77. GRB 130216A: Swift detection of a burst
  78. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  79. GRB 130215A: Fermi GBM detection
  80. GRB 130215A: CARMA 3mm detection
  81. GRB 130215: ROTSE-III Detection of Optical Counterpart
  82. GRB 130215A: Swift detection of a burst
  83. GRB 130211A: GROND detection of the afterglow
  84. GRB 130211A: Swift detection of a burst
  85. GRB 130206A: Fermi LAT Observations
  86. GRB 130131A: optical observation in Mondy observatory
  87. GRB 130206A: Swift detection of a burst
  88. GRB 130131A - UKIRT confirmation of afterglow
  89. GRB 130131A: CARMA 3mm Observations
  90. GRB 130131A: VLA 5.8 Ghz Detection
  91. GRB 130131B: Swift detection of a burst
  92. GRB 130131A: Swift detection of a burst
  93. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  94. GRB 130127A: Fermi GBM detection
  95. GRB 130122A: Swift/UVOT Detection
  96. GRB 130122A: RATIR Detection
  97. GRB 130122A: MASTER-Net early marginal detection of the OT
  98. GRB 130122A: Swift detection of a burst with an optical counterpart
  99. Short GRB 121226A: TNG observation of the host galaxy
  100. GRB 130102B: MAXI/GSC detection

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