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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"
  1. GRB 080212: optical observations
  2. GRB 080212: Enhanced Swift-XRT position
  3. GRB 080212: Swift-XRT Team refined analysis
  4. GRB 080210: Keck photometry
  5. VLA non-detection of GRB 080210
  6. GRB 080212: Swift detection of a burst
  7. IPN localization of GRB 080211
  8. GRB 080212: DSS/2MASS Galaxy at XRT position
  9. GRB 080207: VLT NIR early upper limits
  10. GRB 080210: Swift/UVOT Refined Analysis
  11. GRB 080207: optical observations.
  12. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  13. GRB 080210, Swift-BAT refined analysis
  14. GRB 080210: Super-LOTIS observations
  15. GRB 080210: Swift-XRT Refined Analysis
  16. GRB 080210: VLT redshift
  17. GRB 080210: Enhanced Swift-XRT position
  18. GRB 080210: Rapid PROMPT Detections
  19. GRB 080210: GOND detection in all bands and redshift upper limit
  20. GRB080210 - SDSS Pre-Burst Observations
  21. GRB 080210: Swift detection of a burst with optical afterglow
  22. GRB 080210: TAROT La Silla observatory optical detection
  23. GRB 080207: GROND upper limits
  24. GRB 080205: GAO 150cm telescope Optical limit
  25. GRB 080207, Swift-BAT refined analysis
  26. GRB 080207: Optical limits from Gemini-South
  27. GRB 080205: RTT150 optical observations
  28. Swift detection of AX J1749.1-2639
  29. GRB 080207: Super-LOTIS observations
  30. GRB 080207, Swift-BAT refined analysis
  31. Swift Trigger 302777 is not a GRB
  32. GRB080207: RTT150 Optical Observations
  33. GRB 080207: REM NIR observations
  34. GRB080207: Swift/UVOT refined analysis
  35. GRB 080207: TAROT Calern observatory optical observations
  36. GRB 080207: Swift-XRT Refined Analysis
  37. GRB 080207: Enhanced Swift-XRT position
  38. GRB 080207: Swift detection of a burst
  39. Konus-Wind observation of GRB 080204
  40. GRB 080205 optical upper limit
  41. GRB 080205: MASTER optical observation
  42. GRB 080205: optical observation
  43. VLA radio upper limit on GRB 080205
  44. INT+WFC R-band observations of GRB 080205
  45. GRB 080205, Swift-BAT refined analysis
  46. IPN localization of very hard GRB 080204
  47. GRB 080205: Swift XRT refined analysis
  48. GRB 080205: OA evolution from KAIT observations
  49. GRB 080205: Swift/UVOT observations
  50. GRB 080205: Enhanced Swift-XRT position
  51. GRB 080205: KAIT OA detection
  52. GRB 080205: Swift detection of a burst
  53. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  54. GRB 080130: Swift-BAT refined analysis
  55. GRB 080130: further Swift XRT observations confirm fading source
  56. GRB 080129: Swift/UVOT Refined Upper Limits
  57. Swift/UVOT observations of GRB080130
  58. GRB 080130: REM NIR observations
  59. GRB 080130(?): Swift XRT observation
  60. GRB 080130?: Detection of a possible burst by BATSS
  61. GRB 080129: Optical observations from OSN
  62. GRB 080129: Swift-XRT refined analysis
  63. X-ray transient in NGC 2770: RTT150 optical observations
  64. GRB 080129: KAIT optical limits
  65. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  66. GRB 080129: optical limit by Pi of the Sky
  67. GRB 080129, Swift-BAT refined analysis
  68. GRB 080129: TAROT La Silla observatory optical observations
  69. GRB 080129: Gemini-South photometry
  70. GRB 080129: GROND detection in all bands, and fading
  71. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  72. GRB 080129: Enhanced Swift-XRT position
  73. GRB 080129: Gemini-South Imaging Observations
  74. GRB 080129: Swift XRT position
  75. GRB 080129 (?): UVOT Upper Limits
  76. GRB 080129 (?): Swift detection of a possible burst
  77. A new website of high-level data products for Swift GRBs
  78. GRB 080121: Upper limit on X-ray afterglow
  79. GRB 080123 : Suzaku WAM observation of the prompt emission
  80. Swift trigger(=301779) is not a GRB
  81. Transient 080109/SN 2008D: Spectroscopic Evolution
  82. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum
  83. Konus-Wind observation of GRB 080122
  84. GRB 080122 : Suzaku WAM observation of the prompt emission
  85. GRB 080121: Swift/UVOT upper limits
  86. SNe 2008D and 2007uy: Chandra Detections
  87. GRB 080121 position was incorrect
  88. GRB 080121: Enhanced Swift-XRT position
  89. Two non-burst Swift SubThreshold triggers
  90. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  91. IPN triangulation of GRB080122
  92. GRB 080121: Nearby SDSS galaxies
  93. GRB 080121: Swift-BAT detection of a very weak, short burst
  94. GRB 080123: Swift-XRT refined analysis
  95. GRB 080123: Swift/UVOT refined analysis
  96. X-ray transient in NGC 2770: RTT150 optical observations
  97. GRB 080123, Swift-BAT refined analysis
  98. GRB 080123: Enhanced Swift-XRT position
  99. GRB 080123: Swift detection of a short burst
  100. GRB 080120: GROND confirmation of the optical afterglow

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