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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"

21908 results found.

  1. GRB 120302A: Swift XRT refined analysis
  2. GRB 120312A: CrAO optical upper limit
  3. GRB 120312A: Gemini and UKIRT imaging
  4. GRB 120311A: Optical follow-up
  5. GRB 120311B: Optical follow-up
  6. GRB 120311A: C88 optical limits
  7. GRB 120312A: Swift/UVOT Upper Limits
  8. GRB 120312A: MASTER-NET optical observations
  9. GRB 120312A: WHT candidate afterglow
  10. GRB 120312A: NOT observations
  11. GRB 120312A: Swift-XRT refined Analysis
  12. GRB 120311B: C88 optical limits
  13. GROND observations of GRB 120311A
  14. GRB 120311B: Swift/UVOT Upper Limits
  15. GRB 120311B: MITSuME Okayama Optical upper limits
  16. GRB 120311B: Faulkes Telescope North observations
  17. GRB 120311B: Enhanced Swift-XRT position
  18. GRB 120311B: Swift-BAT refined analysis
  19. GRB 120311B: Swift-XRT observations
  20. GRB 120311A: Swift/UVOT Upper Limits
  21. GRB 120311A: Enhanced Swift-XRT position
  22. GRB 120311A: Swift-XRT observations
  23. GRB 120308A: RTT150 optical observations
  24. GRB 120302A: RTT150 optical observations
  25. GRB 120308A: 1.23m CAHA I-band observations
  26. GRB 120308A: Further PAIRITEL NIR Observations
  27. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  28. GRB 120308A: Swift/UVOT Detection
  29. GRB 120308A: Enhanced Swift-XRT position
  30. GRB 120308A: IAC80 I-band observations
  31. GRB 120308A: PAIRITEL NIR observations
  32. GRB 120308A: confirmation of the optical afterglow
  33. GRB 120308A: Swift detection of a burst
  34. GRB 120305A: D50 optical limits
  35. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  36. GRB 120305A: Swift/UVOT Upper Limits
  37. GRB 120305A: Enhanced Swift-XRT position
  38. GRB 120305A: MASTER-NET early optical observations
  39. GRB 120302A: GROND detection of an afterglow candidate
  40. GRB 111222A: Swift observation on 2012 February 06/07
  41. GRB 120229A: Spectral lag analysis
  42. GRB 120229A: Swift detection of a short burst
  43. Konus-Wind observation of GRB 120226A
  44. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  45. IPN Triangulation of GRB 120226A
  46. GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
  47. GRB 120224A: VLT/X-shooter observations
  48. GRB 120224A: optical observation in Mondy observatory
  49. GRB 120224A: GROND detection of the afterglow candidate
  50. Swift Trigger 516027 is CC Eri
  51. GRB 120224A: Swift/UVOT Upper Limits
  52. GRB 120224A: Enhanced Swift-XRT position
  53. GRB 120224A: Swift detection of a burst
  54. GRB 1202019A: optical observation in Mondy observatory
  55. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  56. GRB 120219A: 1.23m CAHA optical observations
  57. GRB 120219A: Swift/UVOT Upper Limits
  58. GRB 120219A: MITSuME Okayama Optical upper limits
  59. GRB 120219A: Enhanced Swift-XRT position
  60. GRB 120219A: MASTER-NET prompt and early optical observations
  61. GRB 120219A: Swift detection of a burst
  62. GRB 120215A: Swift/UVOT Upper Limits
  63. GRB 120215A: MITSuME Okayama Optical upper limits
  64. GRB 120215A: Enhanced Swift-XRT position
  65. Skynet/PROMPT observations of GRB120215A
  66. GRB 120215A: Swift detection of a burst
  67. GRB 120213A: Swift/UVOT Upper Limits
  68. GRB 120212A: GMG optical observation
  69. GRB 120213A: Enhanced Swift-XRT position
  70. GRB 120212A: MITSuME Ishigakijima Optical Observation
  71. GRB 120213A: Swift-BAT refined analysis
  72. GRB 120213A: MASTER-NET early optical observations
  73. GRB 120213A: Swift detection of a burst
  74. GRB 120212A: NOT optical observation
  75. GRB 120212A: Swift/UVOT Detection
  76. GRB 120212A: Enhanced Swift-XRT position
  77. GRB 120211A: MITSuME Okayama Ks-band Observation
  78. GRB 120212A: Swift-XRT observations
  79. GRB 120211A: GROND Upper limits
  80. GRB 120211A: MITSuME Okayama and Ishigakijima Optical upper limits
  81. GRB 120211A: Swift/UVOT Upper Limits
  82. GRB 120211A: MASTER early optical observations
  83. GRB 120211A: MITSuME Okayama Ks-band upper limit
  84. GRB 120211A: Enhanced Swift-XRT position
  85. GRB 120211A: Swift detection of a burst
  86. GRB 120202A, the review of the sky area in plate archives
  87. GRB 120202A: MASTER early optical observations
  88. GRB 120202A: D50 optical limits
  89. Swift detection of a burst from LS I +61 303
  90. GRB 120202A: GROND observations
  91. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  92. GRB 120202A: Swift/XRT and UVOT observations
  93. GRB 120202A: TAROT Calern observatory optical observations
  94. Konus-Wind observation of GRB 120129A
  95. GRB 120127A / P48 Imaging
  96. GRB 120118B: optical upper limit
  97. GRB 120116A: optical upper limit
  98. GRB 120119A : SMA submm follow-up observation
  99. GRB 120119A: GRT detection of early afterglow
  100. GRB 111225A: optical observations

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