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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"

28234 results found.

  1. GRB 120215A: Enhanced Swift-XRT position
  2. Skynet/PROMPT observations of GRB120215A
  3. GRB 120215A: Swift detection of a burst
  4. GRB 120211A : LOAO optical observations
  5. GRB 120213A: Swift-XRT refined Analysis
  6. GRB 120213A: Swift/UVOT Upper Limits
  7. GRB 120212A: GMG optical observation
  8. GRB 120213A: Enhanced Swift-XRT position
  9. GRB 120212A: MITSuME Ishigakijima Optical Observation
  10. GRB 120213A: Prompt enhanced Swift-XRT position
  11. GRB 120212A: Swift-XRT refined Analysis
  12. GRB 120213A: Swift detection of a burst
  13. GRB 120212A: NOT optical observation
  14. GRB 120212A: Swift/UVOT Detection
  15. GRB 120212A: Enhanced Swift-XRT position
  16. GRB 120212A: Kanata/HOWPol optical observation
  17. GRB 120212A: Swift-XRT observations
  18. GRB 120212A: Swift/UVOT detection
  19. GRB 120212A: Faulkes Telescope South afterglow candidate
  20. GRB 120211A: GROND Upper limits
  21. GRB 120212A: Swift detection of a burst
  22. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  23. GRB 120211A, optical observations
  24. GRB 120211A: Swift-XRT refined Analysis
  25. GRB 120211A: Swift/UVOT Upper Limits
  26. GRB 120211A: MITSuME Okayama Ks-band upper limit
  27. GRB 120211A: Enhanced Swift-XRT position
  28. GRB 120211A - Faulkes Telescope South Observations
  29. GRB 120211A: Swift detection of a burst
  30. GRB 120202A: D50 optical limits
  31. Swift detection of a burst from LS I +61 303
  32. GRB 120202A: GROND observations
  33. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  34. GRB 120202A: Swift/XRT and UVOT observations
  35. GRB 111228A: Possible host detected by Swift/UVOT
  36. GRB 120129A: MASTER optical observations
  37. GRB 120127A: MAXI/GSC detection of a probable GRB
  38. GRB 120116A: optical upper limit
  39. GRB 120119A : LOAO Optical Observations
  40. GRB 120119A: EVLA observations
  41. GRB 120119A: GRT detection of early afterglow
  42. GRB 111225A: optical observations
  43. GRB 120121A: Swift/UVOT Upper Limits
  44. GRB 120121A: Swift-XRT refined Analysis
  45. GRB 120121A: Enhanced Swift-XRT position
  46. GRB 120121A: ISON-NM optical observations
  47. GRB 120121A: Swift-XRT position
  48. GRB 120121A: Swift detection of a burst
  49. GRB 120119A: TAROT La Silla observatory optical observations
  50. GRB120119A: REM NIR observations
  51. GRB 120119A: Swift/UVOT Observations
  52. GRB 120118B: RTT150 optical observations
  53. GRB 120119A: SMARTS optical/IR afterglow observations
  54. GRB 120119A: Swift-XRT refined Analysis
  55. GRB 120119A: Enhanced Swift-XRT position
  56. GRB 120119A: Fermi GBM observation
  57. GRB 120118B: TNG NIR observations
  58. GRB 120118B: Swift-XRT refined Analysis
  59. GRB 120118B : Lulin Optical limit
  60. GRB 120119A: Lick 3m Spectroscopy
  61. GRB 120119A: PROMPT optical observation of early afterglow
  62. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  63. GRB 120118B: Swift/UVOT Upper Limits
  64. GRB 120119A: Liverpool Telescope afterglow detection
  65. GRB 120119A: PAIRITEL NIR Detection
  66. GRB 120119A: Swift detection of a burst with an optical counterpart
  67. GRB 120118B: NOT observations
  68. GRB 120118B: Enhanced Swift-XRT position
  69. GRB 120118B: Faulkes Telescope South observations
  70. GRB 120118B: Swift-XRT position
  71. GRB 120118B: Swift detection of a burst
  72. GRB 120116A: Swift/UVOT Upper Limits
  73. GRB 120116A: Swift-XRT refined Analysis
  74. GRB 120116A: Enhanced Swift-XRT position
  75. AXP 4U 1042+61: Mondy optical observations
  76. GRB 120116A: Mondy optical observations
  77. GRB 120116A: Gemini optical/IR candidate
  78. GRB 120116A: EVLA observations
  79. GRB 120116A: WHT optical observations
  80. GRB 120116A: NOT observations
  81. GRB 120116A: IAC80 I-band observations
  82. GRB 120116A: MASTER Early optical limit
  83. GRB 120116A: Swift detection of a burst
  84. GRB 120106A: optical upper limit
  85. Swift detection of an SGR burst from AXP 4U 0142+61
  86. GRB 120107A: Suzaku WAM observation of the prompt emission
  87. GRB 120106A: MITSuME Okayama Optical Observation (update)
  88. Konus-Wind observation of GRB 120107A
  89. GRB 120106A: Swift/UVOT Upper Limits
  90. GRB 120106A: MITSuME Okayama Ks-band upper limit
  91. GRB 120106A: MASTER Early OT marginally detection
  92. GRB 120106A: Swift-XRT refined Analysis
  93. INTEGRAL Weak trigger #6433: GRT Optical Observation
  94. GRB 120106A: MITSuME Okayama Optical upper limits
  95. GRB 120106A: Enhanced Swift-XRT position
  96. GRB 120106A: TAROT Calern observatory optical observations
  97. GRB 120106A: Swift detection of a burst
  98. GRB111228A :LOAO R-band Observations
  99. GRB 111222A: Second Swift observation
  100. GRB111209A: ATCA detection at 5.5, 9, and 18GHz

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