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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"

28246 results found.

  1. Swift detection of 4U 1630-47
  2. GRB 120422A: MITSuME Ishigakijima upper limit
  3. Swift Trigger 520928 is probably not a burst
  4. GRB 120424A: MAXI/GSC detection of a burst
  5. GRB 120422A: 272 GHz observations from SMA
  6. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  7. GRB 120422A GROND observations
  8. GRB 120422A: EVLA Detection
  9. GRB 120422A: Gemini redshift of candidate host
  10. GRB 120422A: Zadko observatory - Gingin optical observations
  11. GRB 120422A: Swift-XRT refined Analysis
  12. GRB 120422A: A Swift/UVOT Detection
  13. GRB 120422A: Enhanced Swift-XRT position
  14. GRB 120422A: Gemini observations
  15. GRB 120422A: Faulkes Telescope North observations
  16. GRB 120422A: Swift detection of a burst
  17. GRB 120419A: Swift-XRT and UVOT observations
  18. Swift Trigger 519874 is probably a noise event
  19. Trigger 519868: Swift detection of SGR1806-20
  20. GRB 120404A: optical observations in Mondy observatory
  21. GRB 120404A: optical observations
  22. GRB 120404A, Optical Observations
  23. GRB 120404A: SMARTS optical/IR observations
  24. GRB 120404A: EVLA Detection
  25. GRB120404A: GROND observations show steeply decaying afterglow
  26. GRB120404A: MOA optical observations of the initial rise afterglow
  27. GRB 120404A: VLT/X-shooter redshift confirmation
  28. GRB 120404A: Swift/UVOT Detection
  29. GRB 120404A: MITSuME Ishigakijima Optical Observation
  30. GRB 120404A: MITSuME Okayama Optical Observation
  31. GRB 120403B: Swift-XRT refined Analysis
  32. GRB 120404A: Swift-XRT refined Analysis
  33. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  34. GRB 120404A: Enhanced Swift-XRT position
  35. GRB 120403B: TAROT La Silla observatory optical observations
  36. GRB 120404A: Gemini-N Redshift
  37. GRB 120403B: AAT nIR observations
  38. GRB 120404A: MITSuME Akeno Optical upper limits
  39. GRB 120404A: Faulkes Telescope North afterglow confirmation
  40. GRB 120404A: Swift detection of a burst with an optical counterpart
  41. GRB 120403B: Swift/UVOT Upper Limits
  42. GRB 120403B: Enhanced Swift-XRT position
  43. GRB 120403B: Swift detection of a burst
  44. GRB 120320A: optical upper limit in Mondy observatory
  45. GRB 120320A: early optical upper limit
  46. GRB 120402B: Fermi GBM detection
  47. GRB 120328B: Pi of the Sky simultaneous upper limits
  48. GRB 120403A: Swift detection of a burst
  49. GRB 120402A: Swift detection of a possible burst or noise
  50. GRB 120327A: SMARTS optical/IR afterglow observations
  51. GRB 120401A: Swift-XRT refined Analysis
  52. GRB 120326A: HCT optical observations
  53. GRB 120401A: Enhanced Swift-XRT position
  54. GRB 120401A: Prompt enhanced Swift-XRT position
  55. GRB 120401A: Swift detection of a burst
  56. GRB 120326A: EVLA Observations
  57. GRB120327A - ATCA radio afterglow detection at 34GHz
  58. GRB 120324A: CrAO optical upper limit
  59. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  60. GRB 120326A: CARMA 3mm detection
  61. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  62. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  63. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  64. Swift trigger 518853: MASTER-ICATE possible OT
  65. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  66. Trigger 518853: Swift detection of a probable Galactic transient
  67. GRB 120328B: Fermi GBM detection
  68. long/intense GRB 120328B: MASTER follow up observations
  69. GRB 120328A: Swift/UVOT Upper Limits
  70. GRB 120326A: Bassano Bresciano Observatory further optical observations
  71. GRB 120328A: Swift-XRT refined Analysis
  72. GRB 120327A: MITSuME Ishigakijima Optical Observation
  73. GRB 120326A: MITSuME Ishigakijima Optical Observation
  74. GRB 120328A: Enhanced Swift-XRT position
  75. GRB 120327A: NOT optical observations
  76. GRB 120328A: Swift detection of a burst
  77. GRB 120327A: GTC redshift confirmation
  78. GRB 120327A afterglow detection
  79. GRB 120326A: PAIRITEL NIR Observations
  80. GRB 120327A: Swift-XRT refined Analysis
  81. GRB 120327A: CQUEAN grizY Observation
  82. GRB 120326A: LOAO R-band Observations
  83. GRB 120327A: Swift/UVOT further analysis
  84. GRB 120326A : SMA submm observation
  85. GRB 120327A: Enhanced Swift-XRT position
  86. GRB 120327A: X-shooter redshift
  87. GRB 120327A: Gemini-South redshift
  88. GROND observations of GRB 120327A
  89. Skynet/PROMPT observations of GRB120327A
  90. GRB 120326A: Maisoncelles Observatory optical observations
  91. GRB 120327A: Liverpool Telescope Observations
  92. GRB 120327A: TAROT La Silla observatory optical detection
  93. GRB 120327A: Swift detection of a burst with an optical counterpart
  94. GRB 120326A: optical observation of GMG
  95. GRB 120326A : LOT optical observation
  96. GRB 120326A: T17 optical observations
  97. GRB 120326A: GTC redshift
  98. GRB 120326A: CQUEAN grizY Observation
  99. GRB 120326A: Swift-XRT refined Analysis
  100. GRB 120326A: Swift/UVOT Detection

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