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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"

43847 results found.

  1. GRB 120422A: Konkoly optical observations
  2. Fermi GBM Trigger 358364818 is not a GRB
  3. Fermi Trigger 358364818: BOOTES-4 observations
  4. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  5. GRB 120510A: Swift XRT and UVOT observations
  6. GRB 120510A: MASTER follow up observations
  7. GRB 120510A: MAXI/GSC detection of a burst
  8. GRB 120422A: SN identification from GTC
  9. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  10. GRB 120422A: P200 NIR detection
  11. GRB 120422A: CARMA 3mm observations
  12. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  13. GRB 120422A: Gemini-N detection of a supernova
  14. GRB 120422A: i-band re-brightening and possible SN detection
  15. GRB 120427A: MASTER follow up observations
  16. GRB 120422A: optical observations
  17. Konus-Wind observation of GRB 120427A
  18. IPN Triangulation of GRB 120427A
  19. Swift detection of 4U 1630-47
  20. GRB 120422A, the review of the sky area in plate archives
  21. Konus-Wind observation of GRB 120426A
  22. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  23. IPN Triangulation of bright GRB 120426A
  24. Swift Trigger 520928 is a noise event
  25. Swift Trigger 520928 is probably not a burst
  26. GRB 120424A: MAXI/GSC detection of a burst
  27. GRB 120422A: 272 GHz observations from SMA
  28. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  29. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  30. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  31. GRB 120422A GROND observations
  32. GRB 120422A: Super-LOTIS early observations
  33. GRB 120422A: EVLA Detection
  34. GRB 120422A: NOT optical observations
  35. GRB 120422A: Gemini redshift of candidate host
  36. GRB 120422A: Zadko observatory - Gingin optical observations
  37. GRB 120422A: Swift-XRT refined Analysis
  38. GRB 120422A: A Swift/UVOT Detection
  39. GRB 120422A: Enhanced Swift-XRT position
  40. GRB 120422A: Swift-BAT refined analysis
  41. GRB 120422A: Gemini observations
  42. GRB 120422A: Faulkes Telescope North observations
  43. GRB 120422A: Swift detection of a burst
  44. GRB 120419A: Swift-XRT and UVOT observations
  45. GRB 120419A: A long GRB detected by INTEGRAL
  46. Swift Trigger 519874 is a noise event
  47. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  48. Swift Trigger 519874 is probably a noise event
  49. Trigger 519868: Swift detection of SGR1806-20
  50. GRB 120404A: optical observations in Mondy observatory
  51. GRB 120404A: optical observations
  52. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  53. GRB 120404A: SMARTS optical/IR observations
  54. GRB 120404A: EVLA Detection
  55. GRB 120404A: MASTER OT observations
  56. GRB120404A: GROND observations show steeply decaying afterglow
  57. GRB120404A: MOA optical observations of the initial rise afterglow
  58. GRB 120404A: VLT/X-shooter redshift confirmation
  59. GRB 120404A: Swift/UVOT Detection
  60. GRB 120403B: Swift-XRT refined Analysis
  61. GRB 120404A: Swift-XRT refined Analysis
  62. GRB 120404A : TNT optical observation
  63. GRB 120404A: Swift-BAT refined analysis
  64. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  65. GRB 120404A: Enhanced Swift-XRT position
  66. GRB 120404A: Gemini-N Redshift correction
  67. GRB 120402B: MASTER early OT limit
  68. GRB 120403B: TAROT La Silla observatory optical observations
  69. GRB 120403B: Fermi GBM Observation
  70. GRB 120404A: Gemini-N Redshift
  71. GRB 120404A: MITSuME Akeno Optical upper limits
  72. GRB 120404A: MASTER early OT limit
  73. GRB 120404A: Faulkes Telescope North afterglow confirmation
  74. GRB 120404A: Swift detection of a burst with an optical counterpart
  75. GRB 120403B: Swift-BAT refined analysis
  76. GRB 120403B: Swift/UVOT Upper Limits
  77. GRB 120403B: Enhanced Swift-XRT position
  78. GRB 120403A: Swift/BAT spectral lag analysis
  79. GRB 120403B: Swift detection of a burst
  80. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  81. GRB 120326A, the review of the sky area in plate archives
  82. GRB 120402A: optical upper limit
  83. GRB 120320A: optical upper limit in Mondy observatory
  84. GRB 120320A: early optical upper limit
  85. GRB 120403A: MASTER follow up observations
  86. GRB 120402A: MASTER follow up observations
  87. GRB 120403A, Swift-BAT refined analysis
  88. GRB 120402B: Fermi GBM detection
  89. GRB 120328B: Pi of the Sky simultaneous upper limits
  90. GRB 120403A: Swift detection of a burst
  91. GRB 120402A: Swift detection of a possible burst or noise
  92. GRB 120326A: Cima Rest and Bassano Brescia
  93. GRB 120327A: SMARTS optical/IR afterglow observations
  94. GRB 120401A: Swift-XRT refined Analysis
  95. GRB 120401A: Swift-BAT refined analysis
  96. GRB 120326A: HCT optical observations
  97. GRB 120401A: Enhanced Swift-XRT position
  98. GRB 120401A: Prompt enhanced Swift-XRT position
  99. GRB 120401A: Swift detection of a burst
  100. GRB 120326A: EVLA Observations

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