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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"

28102 results found.

  1. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  2. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  3. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  4. Swift trigger 518853: MASTER-ICATE possible OT
  5. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  6. Trigger 518853: Swift detection of a probable Galactic transient
  7. GRB 120328B: Fermi-LAT Observations
  8. GRB 120327A: Zadko optical observations
  9. GRB 120328B: Fermi GBM detection
  10. GRB 120328A: Swift/UVOT Upper Limits
  11. GRB 120328A: Swift-XRT refined Analysis
  12. IPN Triangulation of GRB 120328B (long/intense)
  13. GRB 120327A: MITSuME Ishigakijima Optical Observation
  14. GRB 120326A: MITSuME Ishigakijima Optical Observation
  15. GRB 120328A: Swift-BAT refined analysis
  16. GRB 120328A: Enhanced Swift-XRT position
  17. GRB 120327A: NOT optical observations
  18. GRB 120328A: TAROT La Silla observatory optical observations
  19. Skynet/PROMPT observations of GRB120328A
  20. GRB 120328A: Swift detection of a burst
  21. GRB 120326A: Fermi GBM Observation
  22. GRB 120327A afterglow detection
  23. GRB 120326A: PAIRITEL NIR Observations
  24. GRB 120326A: Bassano Bresciano Observatory optical observations
  25. GRB 120327A: Swift-XRT refined Analysis
  26. GRB 120326A: LOAO R-band Observations
  27. GRB 120327A: Swift/UVOT further analysis
  28. GRB 120327A: Swift-BAT refined analysis
  29. GRB 120326A : SMA submm observation
  30. GRB 120327A: Enhanced Swift-XRT position
  31. GRB 120327A: X-shooter redshift
  32. GROND observations of GRB 120327A
  33. GRB 120327A: REM NIR and optical observations
  34. Skynet/PROMPT observations of GRB120327A
  35. GRB 120327A: Liverpool Telescope Observations
  36. GRB 120327A: TAROT La Silla observatory optical detection
  37. GRB 120327A: Swift detection of a burst with an optical counterpart
  38. GRB 120326A : LOT optical observation
  39. GRB 120326A: Swift-BAT refined analysis
  40. GRB 120326A: Swift-XRT refined Analysis
  41. GRB 120326A: Swift/UVOT Detection
  42. GRB 120326A: Optical observations at Crni Vrh
  43. GRB 120326A: Liverpool Telescope observations
  44. GRB 120326A: Enhanced Swift-XRT position
  45. GRB 120326A: TAROT Calern observatory afterglow optical detection
  46. GRB 120326A: Swift detection of a burst
  47. IPN Triangulation of GRB 120323A (short/very intense)
  48. GRB 120324A: Swift-XRT refined Analysis
  49. GRB 120323A: Fermi GBM detection
  50. GRB 120324A: GROND observations
  51. GRB 120324A: CQUEAN rizY Observation
  52. GRB 120324A: Swift-BAT refined analysis
  53. GRB 120324A: Swift/UVOT Upper Limits
  54. GRB 120324A: TAROT La Silla observatory optical observations
  55. GRB 120324A: Enhanced Swift-XRT position
  56. GRB 120324A: Liverpool Telescope optical candidate
  57. GRB 120324A: Swift detection of a burst
  58. Simultaneous optical images of Swift pointing are available by GRT
  59. GRB 120316A : Suzaku WAM observation of the prompt emission
  60. GRB 120320A: Zadko optical observations
  61. GRB 120320A, the review of the sky area in plate archives
  62. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  63. GRB 120229A: Magellan observations and limit on an optical afterglow
  64. GRB 120320A: Swift/UVOT Upper Limits
  65. GRB 120320A: MITSuME Okayama Optical upper limits
  66. GRB 120320A , optical observations
  67. GRB 120320A: BOOTES-4 optical upper limit
  68. GRB 120320A: Swift-XRT refined Analysis
  69. GRB 120320A, Swift-BAT refined analysis
  70. GRB 120320A: Gemini-N and UKIRT observations
  71. GRB 120320A: Enhanced Swift-XRT position
  72. IPN Triangulation of GRB 120316A
  73. GRB 120320A: Swift detection of a burst
  74. GRB 111228A: possible detection of the SN with the TNG
  75. Trigger 517876 is a Swift detection of GX 5-1
  76. GRB 120302A: Swift XRT refined analysis
  77. GRB 120312A, the review of the sky area in plate archives
  78. GRB 120312A: CrAO optical upper limit
  79. GRB 120312A: Gemini and UKIRT imaging
  80. GRB 120311A, the review of the sky area in plate archives
  81. GRB 120311A: Optical follow-up
  82. GRB 120311B: Optical follow-up
  83. GRB 120311A: C88 optical limits
  84. GRB 120312A: Swift/UVOT Upper Limits
  85. GRB 120312A: WHT candidate afterglow
  86. GRB 120312A: NOT observations
  87. GRB 120312A: Swift-XRT refined Analysis
  88. GRB 120312A: Swift-BAT refined analysis
  89. GRB 120311B: C88 optical limits
  90. GRB 120312A: Swift detection of a burst
  91. GROND observations of GRB 120311A
  92. GRB 120311B: Swift/UVOT Upper Limits
  93. GRB 120311B: MITSuME Okayama Optical upper limits
  94. GRB 120311B: Faulkes Telescope North observations
  95. GRB 120311B: Swift-XRT refined Analysis
  96. GRB 120311A: Swift-XRT refined Analysis
  97. GRB 120311B: Enhanced Swift-XRT position
  98. GRB 120311B: Swift-BAT refined analysis
  99. GRB 120311B: Swift-XRT observations
  100. GRB 120311A, Swift-BAT refined analysis

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