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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"

20502 results found.

  1. GRB 120302A: GROND detection of an afterglow candidate
  2. GRB 111222A: Swift observation on 2012 February 06/07
  3. GRB 120229A: Spectral lag analysis
  4. Konus-Wind observation of GRB 120226A
  5. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  6. IPN Triangulation of GRB 120226A
  7. GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
  8. GRB 120224A: optical observation in Mondy observatory
  9. GRB 120226A: Fermi-LAT detection of a burst
  10. GRB 120224A: GROND detection of the afterglow candidate
  11. GRB 120219A, the review of the sky area in plate archives
  12. Swift Trigger 516027 is CC Eri
  13. GRB 120224A: Swift/UVOT Upper Limits
  14. GRB 120224A: Enhanced Swift-XRT position
  15. GRB 120224A: Swift detection of a burst
  16. GRB 1202019A: optical observation in Mondy observatory
  17. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  18. GRB 120219A: 1.23m CAHA optical observations
  19. GRB 120219A: Swift/UVOT Upper Limits
  20. GRB 120219A: MITSuME Okayama Optical upper limits
  21. GRB 120219A: Enhanced Swift-XRT position
  22. GRB 120219A: MASTER-NET prompt and early optical observations
  23. GRB 120219A: Swift detection of a burst
  24. GRB 120218A: Swift-BAT refined analysis
  25. GRB 120215A: Swift/UVOT Upper Limits
  26. GRB 120215A: MITSuME Okayama Optical upper limits
  27. GRB 120215A: Enhanced Swift-XRT position
  28. Skynet/PROMPT observations of GRB120215A
  29. GRB 120215A: Swift-BAT refined analysis
  30. GRB 120215A: Swift detection of a burst
  31. GRB 120211A : LOAO optical observations
  32. GRB 120213A: Swift/UVOT Upper Limits
  33. GRB 120212A: GMG optical observation
  34. GRB 120213A: Enhanced Swift-XRT position
  35. GRB 120212A: MITSuME Ishigakijima Optical Observation
  36. GRB 120213A: Swift detection of a burst
  37. GRB 120212A: NOT optical observation
  38. GRB 120212A: Swift/UVOT Detection
  39. GRB 120212A: Enhanced Swift-XRT position
  40. GRB 120211A: MITSuME Okayama Ks-band Observation
  41. GRB 120212A: Swift-XRT observations
  42. GRB 120211A: GROND Upper limits
  43. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  44. GRB 120211A, optical observations
  45. GRB 120211A: Swift/UVOT Upper Limits
  46. GRB 120211A: MITSuME Okayama Ks-band upper limit
  47. GRB 120211A: Enhanced Swift-XRT position
  48. GRB 120211A: Swift detection of a burst
  49. GRB 120202A: D50 optical limits
  50. Swift detection of a burst from LS I +61 303
  51. GRB 120202A: GROND observations
  52. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  53. GRB 120202A: Swift/XRT and UVOT observations
  54. GRB 120202A: TAROT Calern observatory optical observations
  55. Konus-Wind observation of GRB 120129A
  56. GRB 120127A / P48 Imaging
  57. GRB 120127A: MAXI/GSC detection of a probable GRB
  58. GRB 120118B: optical upper limit
  59. GRB 120116A: optical upper limit
  60. GRB 120119A : SMA submm follow-up observation
  61. GRB 120119A: GRT detection of early afterglow
  62. GRB 111225A: optical observations
  63. GRB 120119A: optical upper limit
  64. GRB 120121A: Swift/UVOT Upper Limits
  65. GRB 120121A: Enhanced Swift-XRT position
  66. GRB 120121A: ISON-NM optical observations
  67. GRB 120121A: Swift detection of a burst
  68. GRB 120119A: TAROT La Silla observatory optical observations
  69. GRB120119A: REM NIR observations
  70. GRB 120119A: optical observations
  71. GRB 120119A: Swift/UVOT Observations
  72. GRB 120118B: RTT150 optical observations
  73. GRB 120119A: SMARTS optical/IR afterglow observations
  74. GRB 120119A: Enhanced Swift-XRT position
  75. GRB 120119A: optical observations
  76. GRB 120118B: TNG NIR observations
  77. GRB 120119A: PROMPT optical observation of early afterglow
  78. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  79. GRB 120118B: Swift/UVOT Upper Limits
  80. GRB 120119A: PAIRITEL NIR Detection
  81. GRB 120119A: Swift detection of a burst with an optical counterpart
  82. GRB 120118B: NOT observations
  83. GRB 120118B: Enhanced Swift-XRT position
  84. XRF 120118A: early optical limit by "Pi of the Sky"
  85. GRB 120118B: Swift detection of a burst
  86. XRF 120118A: Optical candidate
  87. GRB 120116A: Swift/UVOT Upper Limits
  88. GRB 120116A: Enhanced Swift-XRT position
  89. AXP 4U 1042+61: Mondy optical observations
  90. GRB 120116A: Mondy optical observations
  91. GRB 120116A: WHT optical observations
  92. GRB 120116A: Optical observations at Crni Vrh
  93. GRB 120116A: NOT observations
  94. GRB 120116A: IAC80 I-band observations
  95. GRB 120116A: Bassano Bresciano Observatory optical observations
  96. GRB 120116A: Swift detection of a burst
  97. GRB 111228A: optical observations
  98. GRB 120106A: optical upper limit
  99. Swift detection of an SGR burst from AXP 4U 0142+61
  100. GRB 120106A: Swift/UVOT Upper Limits

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