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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"

26667 results found.

  1. GRB 120219A: MASTER-NET prompt and early optical observations
  2. GRB 120219A: Swift detection of a burst
  3. GRB 120218A: Swift detection of a burst
  4. GRB 120215A: Swift/UVOT Upper Limits
  5. GRB 120215A: MITSuME Okayama Optical upper limits
  6. GRB 120215A: Swift-XRT refined Analysis
  7. Fermi GBM detection of an SGR-like burst
  8. GRB 120215A: Enhanced Swift-XRT position
  9. Skynet/PROMPT observations of GRB120215A
  10. GRB 120215A: Swift-BAT refined analysis
  11. GRB 120215A: Swift detection of a burst
  12. GRB 120213A: Swift-XRT refined Analysis
  13. GRB 120213A: Swift/UVOT Upper Limits
  14. GRB 120212A: Fermi GBM observation
  15. GRB 120212A: GMG optical observation
  16. GRB 120213A: Enhanced Swift-XRT position
  17. GRB 120212A: MITSuME Ishigakijima Optical Observation
  18. GRB 120212A: Swift-XRT refined Analysis
  19. GRB 120213A: Swift detection of a burst
  20. GRB 120212A: NOT optical observation
  21. GRB 120212A: Swift/UVOT Detection
  22. GRB 120212A: Enhanced Swift-XRT position
  23. GRB 120211A: MITSuME Okayama Ks-band Observation
  24. GRB 120212A: Swift-XRT observations
  25. GRB 120212A: Faulkes Telescope South afterglow candidate
  26. GRB 120211A: GROND Upper limits
  27. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  28. GRB 120211A: Swift-XRT refined Analysis
  29. GRB 120211A: Swift/UVOT Upper Limits
  30. GRB 120211A: Swift-BAT refined analysis
  31. GRB 120211A: MITSuME Okayama Ks-band upper limit
  32. GRB 120211A: Enhanced Swift-XRT position
  33. GRB 120211A - Faulkes Telescope South Observations
  34. GRB 120211A: Swift detection of a burst
  35. GRB 120202A: D50 optical limits
  36. Swift detection of a burst from LS I +61 303
  37. GRB 120202A: GROND observations
  38. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  39. GRB 120202A: Swift/XRT and UVOT observations
  40. GRB 120202A: TAROT Calern observatory optical observations
  41. GRB 120202A: A long GRB detected by INTEGRAL
  42. GRB 120127A / P48 Imaging
  43. GRB 120118B: optical upper limit
  44. GRB 120116A: optical upper limit
  45. GRB 120119A : LOAO Optical Observations
  46. GRB 120119A : SMA submm follow-up observation
  47. GRB 120119A: GRT detection of early afterglow
  48. GRB 111225A: optical observations
  49. GRB 120119A: optical upper limit
  50. GRB 120121A: Swift/UVOT Upper Limits
  51. GRB 120121A: Swift-XRT refined Analysis
  52. GRB 120121A: Swift-BAT refined analysis
  53. GRB 120121A: Enhanced Swift-XRT position
  54. GRB 120121A: ISON-NM optical observations
  55. GRB 120121A: Swift detection of a burst
  56. GRB 120119A: TAROT La Silla observatory optical observations
  57. GRB120119A: REM NIR observations
  58. GRB 120119A: optical observations
  59. GRB 120119A: Swift/UVOT Observations
  60. GRB 120118B: RTT150 optical observations
  61. GRB 120119A: SMARTS optical/IR afterglow observations
  62. GRB 120119A: Swift-XRT refined Analysis
  63. GRB 120119A: Enhanced Swift-XRT position
  64. GRB 120119A: Fermi GBM observation
  65. GRB 120119A: optical observations
  66. GRB 120118B: TNG NIR observations
  67. GRB 120118B: Swift-XRT refined Analysis
  68. GRB 120119A: PROMPT optical observation of early afterglow
  69. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  70. GRB 120118B: Swift/UVOT Upper Limits
  71. GRB 120119A: Liverpool Telescope afterglow detection
  72. GRB 120119A: PAIRITEL NIR Detection
  73. GRB 120119A: Swift detection of a burst with an optical counterpart
  74. GRB 120118B: NOT observations
  75. GRB 120118B: Enhanced Swift-XRT position
  76. GRB 120118B: Faulkes Telescope South observations
  77. XRF 120118A: early optical limit by "Pi of the Sky"
  78. GRB 120118B: Swift detection of a burst
  79. XRF 120118A: Optical candidate
  80. GRB 120116A: Swift/UVOT Upper Limits
  81. GRB 120116A: Swift-XRT refined Analysis
  82. GRB 120116A: Enhanced Swift-XRT position
  83. AXP 4U 1042+61: Mondy optical observations
  84. GRB 120116A: Mondy optical observations
  85. GRB 120116A: Gemini optical/IR candidate
  86. GRB 120116A: WHT optical observations
  87. GRB 120116A: Optical observations at Crni Vrh
  88. GRB 120116A: Swift-BAT refined analysis
  89. GRB 120116A: NOT observations
  90. GRB 120116A: IAC80 I-band observations
  91. GRB 120116A: Bassano Bresciano Observatory optical observations
  92. GRB 120116A: Swift detection of a burst
  93. GRB 111228A: optical observations
  94. GRB 120106A: optical upper limit
  95. Swift detection of an SGR burst from AXP 4U 0142+61
  96. GRB 120107A: Suzaku WAM observation of the prompt emission
  97. GRB 120107A: Fermi GBM observation
  98. Konus-Wind observation of GRB 120107A
  99. GRB 120106A: Swift/UVOT Upper Limits
  100. GRB 120106A: Bassano Bresciano Observatory optical observations

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