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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"

43090 results found.

  1. GRB 120514A: TAROT Calern observatory optical observations
  2. GRB 120514A: Swift detection of a burst
  3. GRB 120422A: Konkoly optical observations
  4. Fermi GBM Trigger 358364818 is not a GRB
  5. Fermi Trigger 358364818: BOOTES-4 observations
  6. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  7. GRB 120510A: Swift XRT and UVOT observations
  8. GRB 120510A: MASTER follow up observations
  9. GRB 120510A: MAXI/GSC detection of a burst
  10. GRB 120422A: SN identification from GTC
  11. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  12. GRB 120422A: P200 NIR detection
  13. GRB 120422A: CARMA 3mm observations
  14. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  15. GRB 120422A: i-band re-brightening and possible SN detection
  16. GRB 120427A: MASTER follow up observations
  17. GRB 120422A: optical observations
  18. Konus-Wind observation of GRB 120427A
  19. IPN Triangulation of GRB 120427A
  20. Swift detection of 4U 1630-47
  21. GRB 120422A, the review of the sky area in plate archives
  22. Konus-Wind observation of GRB 120426A
  23. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  24. IPN Triangulation of bright GRB 120426A
  25. Swift Trigger 520928 is a noise event
  26. GRB 120422A: MITSuME Ishigakijima upper limit
  27. Swift Trigger 520928 is probably not a burst
  28. GRB 120424A: MAXI/GSC detection of a burst
  29. GRB 120422A: 272 GHz observations from SMA
  30. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  31. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  32. GRB 120422A GROND observations
  33. GRB 120422A: Super-LOTIS early observations
  34. GRB 120422A: EVLA Detection
  35. GRB 120422A: NOT optical observations
  36. GRB 120422A: Gemini redshift of candidate host
  37. GRB 120422A: Zadko observatory - Gingin optical observations
  38. GRB 120422A: Swift-XRT refined Analysis
  39. GRB 120422A: A Swift/UVOT Detection
  40. GRB 120422A: Enhanced Swift-XRT position
  41. GRB 120422A: Swift-BAT refined analysis
  42. GRB 120422A: Swift detection of a burst
  43. GRB 120419A: Swift-XRT and UVOT observations
  44. GRB 120419A: A long GRB detected by INTEGRAL
  45. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  46. Swift Trigger 519874 is probably a noise event
  47. Trigger 519868: Swift detection of SGR1806-20
  48. GRB 120404A: optical observations
  49. GRB 120404A, Optical Observations
  50. GRB 120404A: SMARTS optical/IR observations
  51. GRB 120404A: EVLA Detection
  52. GRB 120404A: MASTER OT observations
  53. GRB120404A: GROND observations show steeply decaying afterglow
  54. GRB120404A: MOA optical observations of the initial rise afterglow
  55. GRB 120404A: VLT/X-shooter redshift confirmation
  56. GRB 120404A: Swift/UVOT Detection
  57. GRB 120404A: MITSuME Ishigakijima Optical Observation
  58. GRB 120404A: MITSuME Okayama Optical Observation
  59. GRB 120403B: Swift-XRT refined Analysis
  60. GRB 120404A: Swift-XRT refined Analysis
  61. GRB 120404A : TNT optical observation
  62. GRB 120404A: Swift-BAT refined analysis
  63. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  64. GRB 120404A: Enhanced Swift-XRT position
  65. GRB 120404A: Gemini-N Redshift correction
  66. GRB 120402B: MASTER early OT limit
  67. GRB 120403B: TAROT La Silla observatory optical observations
  68. GRB 120403B: Fermi GBM Observation
  69. GRB 120403B: AAT nIR observations
  70. GRB 120404A: MITSuME Akeno Optical upper limits
  71. GRB 120404A: MASTER early OT limit
  72. GRB 120404A: Swift detection of a burst with an optical counterpart
  73. GRB 120403B: Swift-BAT refined analysis
  74. GRB 120403B: Swift/UVOT Upper Limits
  75. GRB 120403B: Enhanced Swift-XRT position
  76. GRB 120403B: Swift detection of a burst
  77. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  78. GRB 120326A, the review of the sky area in plate archives
  79. GRB 120403A: MASTER follow up observations
  80. GRB 120402A: MASTER follow up observations
  81. GRB 120403A, Swift-BAT refined analysis
  82. GRB 120402B: Fermi GBM detection
  83. GRB 120328B: Pi of the Sky simultaneous upper limits
  84. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  85. GRB 120403A: Swift detection of a burst
  86. GRB 120402A: Swift detection of a possible burst or noise
  87. GRB 120326A: Cima Rest and Bassano Brescia
  88. GRB 120327A: SMARTS optical/IR afterglow observations
  89. GRB 120401A: Swift-XRT refined Analysis
  90. GRB 120401A: Swift-BAT refined analysis
  91. GRB 120326A: HCT optical observations
  92. GRB 120401A: Enhanced Swift-XRT position
  93. GRB 120401A: Prompt enhanced Swift-XRT position
  94. GRB 120401A: Swift detection of a burst
  95. GRB 120326A: EVLA Observations
  96. GRB120327A - ATCA radio afterglow detection at 34GHz
  97. GRB 120324A: CrAO optical upper limit
  98. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  99. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  100. GRB 120326A : Suzaku WAM observation of the prompt emission

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