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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"

26672 results found.

  1. Skynet/PROMPT observations of GRB120327A
  2. GRB 120327A: Liverpool Telescope Observations
  3. GRB 120327A: TAROT La Silla observatory optical detection
  4. GRB 120327A: Swift detection of a burst with an optical counterpart
  5. GRB 120326A : LOT optical observation
  6. GRB 120326A: Swift-BAT refined analysis
  7. GRB 120326A: Swift-XRT refined Analysis
  8. GRB 120326A: Swift/UVOT Detection
  9. GRB 120326A: Liverpool Telescope observations
  10. GRB 120326A: Enhanced Swift-XRT position
  11. GRB 120326A: TAROT Calern observatory afterglow optical detection
  12. GRB 120326A: Swift detection of a burst
  13. IPN Triangulation of GRB 120323A (short/very intense)
  14. GRB 120324A: Swift-XRT refined Analysis
  15. GRB 120323A: Fermi GBM detection
  16. GRB 120324A: GROND observations
  17. GRB 120324A: CQUEAN rizY Observation
  18. GRB 120324A: Swift-BAT refined analysis
  19. GRB 120324A: Swift/UVOT Upper Limits
  20. GRB 120324A: TAROT La Silla observatory optical observations
  21. GRB 120324A: Enhanced Swift-XRT position
  22. GRB 120324A: Liverpool Telescope optical candidate
  23. GRB 120324A: Swift detection of a burst
  24. GRB 120316A : Suzaku WAM observation of the prompt emission
  25. GRB 120320A: Zadko optical observations
  26. GRB 120229A: Magellan observations and limit on an optical afterglow
  27. GRB 120320A: Swift/UVOT Upper Limits
  28. GRB 120320A: MITSuME Okayama Optical upper limits
  29. GRB 120320A , optical observations
  30. GRB 120320A: BOOTES-4 optical upper limit
  31. GRB 120320A: Swift-XRT refined Analysis
  32. GRB 120320A: Gemini-N and UKIRT observations
  33. GRB 120320A: Enhanced Swift-XRT position
  34. IPN Triangulation of GRB 120316A
  35. GRB 120320A: Swift detection of a burst
  36. GRB 111228A: possible detection of the SN with the TNG
  37. GRB 120302A: Swift XRT refined analysis
  38. GRB 120312A: CrAO optical upper limit
  39. GRB 120312A: Gemini and UKIRT imaging
  40. GRB 120311A: Optical follow-up
  41. GRB 120311B: Optical follow-up
  42. GRB 120311A: C88 optical limits
  43. GRB 120312A: Swift/UVOT Upper Limits
  44. GRB 120312A: WHT candidate afterglow
  45. GRB 120312A: NOT observations
  46. GRB 120312A: Swift-XRT refined Analysis
  47. GRB 120311B: C88 optical limits
  48. GRB 120312A: Swift detection of a burst
  49. GROND observations of GRB 120311A
  50. GRB 120311B: Swift/UVOT Upper Limits
  51. GRB 120311B: MITSuME Okayama Optical upper limits
  52. GRB 120311B: Faulkes Telescope North observations
  53. GRB 120311B: Swift-XRT refined Analysis
  54. GRB 120311A: Swift-XRT refined Analysis
  55. GRB 120311B: Enhanced Swift-XRT position
  56. GRB 120311B: Swift-XRT observations
  57. GRB 120311A: Swift/UVOT Upper Limits
  58. GRB 120311A: Enhanced Swift-XRT position
  59. GRB 120311A: Swift-XRT observations
  60. GRB 120311A: Liverpool Telescope optical candidate
  61. GRB 120308A: RTT150 optical observations
  62. GRB 120302A: RTT150 optical observations
  63. GRB 120308A: 1.23m CAHA I-band observations
  64. GRB 120308A: Further PAIRITEL NIR Observations
  65. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  66. GRB 120308A: Swift/UVOT Detection
  67. GRB 120308A: Swift-XRT refined Analysis
  68. GRB 120308A: Enhanced Swift-XRT position
  69. GRB 120308A: IAC80 I-band observations
  70. GRB 120308A: PAIRITEL NIR observations
  71. GRB 120308A: confirmation of the optical afterglow
  72. GRB 120308A: Liverpool Telescope optical afterglow candidate
  73. GRB 120308A: Swift detection of a burst
  74. GRB 120305A: D50 optical limits
  75. GRB 120302A: Fermi GBM Observation
  76. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  77. GRB 120305A: Swift/UVOT Upper Limits
  78. GRB 120305A: Swift-XRT refined Analysis
  79. GRB 120305A: Enhanced Swift-XRT position
  80. GRB 120305A: Swift-BAT refined analysis
  81. GRB 120305A - Liverpool Telescope Observations
  82. GRB 120305A: Swift detection of a short burst
  83. GRB 120302A: GROND detection of an afterglow candidate
  84. GRB 111222A: Swift observation on 2012 February 06/07
  85. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  86. GRB 120226A: Fermi-LAT data analysis
  87. IPN Triangulation of GRB 120226A
  88. GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
  89. GRB 120224A: optical observation in Mondy observatory
  90. GRB 120224A: GROND detection of the afterglow candidate
  91. GRB 120224A: Swift-XRT refined Analysis
  92. Swift Trigger 516027 is CC Eri
  93. GRB 120224A: Swift/UVOT Upper Limits
  94. GRB 120224A: FTN optical observations
  95. GRB 120224A: Enhanced Swift-XRT position
  96. GRB 120224A: Swift detection of a burst
  97. GRB 1202019A: optical observation in Mondy observatory
  98. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  99. GRB 120219A: 1.23m CAHA optical observations
  100. GRB 120219A, optical observations

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