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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. Konus-Wind observation of GRB 080211
  2. VLA radio upper limit on GRB 080212
  3. Swift/UVOT refined analysis of GRB080212
  4. GRB 080212, Swift-BAT refined analysis
  5. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  6. GRB 080212: Gemini-South optical observations
  7. GRB 080212: GROND detects afterglow
  8. GRB 080212: REM NIR afterglow?
  9. GRB 080212: optical observations
  10. GRB 080212: Enhanced Swift-XRT position
  11. GRB 080212: Swift-XRT Team refined analysis
  12. GRB 080210: Keck photometry
  13. VLA non-detection of GRB 080210
  14. GRB 080212: Swift detection of a burst
  15. IPN localization of GRB 080211
  16. GRB 080212: DSS/2MASS Galaxy at XRT position
  17. GRB 080207: VLT NIR early upper limits
  18. GRB 080210: Swift/UVOT Refined Analysis
  19. GRB 080207: optical observations.
  20. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  21. GRB 080210, Swift-BAT refined analysis
  22. GRB 080210: Super-LOTIS observations
  23. GRB 080210: Swift-XRT Refined Analysis
  24. GRB 080210: VLT redshift
  25. GRB 080210: Enhanced Swift-XRT position
  26. GRB 080210: Rapid PROMPT Detections
  27. GRB 080210: GOND detection in all bands and redshift upper limit
  28. GRB080210 - SDSS Pre-Burst Observations
  29. GRB 080210: Swift detection of a burst with optical afterglow
  30. GRB 080210: TAROT La Silla observatory optical detection
  31. GRB 080207: GROND upper limits
  32. GRB 080205: GAO 150cm telescope Optical limit
  33. GRB 080207, Swift-BAT refined analysis
  34. GRB 080207: Optical limits from Gemini-South
  35. GRB 080205: RTT150 optical observations
  36. Swift detection of AX J1749.1-2639
  37. GRB 080207: Super-LOTIS observations
  38. GRB 080207, Swift-BAT refined analysis
  39. Swift Trigger 302777 is not a GRB
  40. GRB080207: RTT150 Optical Observations
  41. GRB 080207: REM NIR observations
  42. GRB080207: Swift/UVOT refined analysis
  43. GRB 080207: TAROT Calern observatory optical observations
  44. GRB 080207: Swift-XRT Refined Analysis
  45. GRB 080207: Enhanced Swift-XRT position
  46. GRB 080207: Swift detection of a burst
  47. Konus-Wind observation of GRB 080204
  48. GRB 080205 optical upper limit
  49. GRB 080205: MASTER optical observation
  50. GRB 080205: optical observation
  51. VLA radio upper limit on GRB 080205
  52. INT+WFC R-band observations of GRB 080205
  53. GRB 080205, Swift-BAT refined analysis
  54. IPN localization of very hard GRB 080204
  55. GRB 080205: Swift XRT refined analysis
  56. GRB 080205: OA evolution from KAIT observations
  57. GRB 080205: Swift/UVOT observations
  58. GRB 080205: Enhanced Swift-XRT position
  59. GRB 080205: KAIT OA detection
  60. GRB 080205: Swift detection of a burst
  61. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  62. GRB 080130: Swift-BAT refined analysis
  63. GRB 080130: further Swift XRT observations confirm fading source
  64. GRB 080129: Swift/UVOT Refined Upper Limits
  65. Swift/UVOT observations of GRB080130
  66. GRB 080130: REM NIR observations
  67. GRB 080130(?): Swift XRT observation
  68. GRB 080130?: Detection of a possible burst by BATSS
  69. GRB 080129: Optical observations from OSN
  70. GRB 080129: Swift-XRT refined analysis
  71. X-ray transient in NGC 2770: RTT150 optical observations
  72. GRB 080129: KAIT optical limits
  73. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  74. GRB 080129: optical limit by Pi of the Sky
  75. GRB 080129, Swift-BAT refined analysis
  76. GRB 080129: TAROT La Silla observatory optical observations
  77. GRB 080129: Gemini-South photometry
  78. GRB 080129: GROND detection in all bands, and fading
  79. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  80. GRB 080129: Enhanced Swift-XRT position
  81. GRB 080129: Gemini-South Imaging Observations
  82. GRB 080129: Swift XRT position
  83. GRB 080129 (?): UVOT Upper Limits
  84. GRB 080129 (?): Swift detection of a possible burst
  85. A new website of high-level data products for Swift GRBs
  86. GRB 080121: Upper limit on X-ray afterglow
  87. GRB 080123 : Suzaku WAM observation of the prompt emission
  88. Swift trigger(=301779) is not a GRB
  89. Transient 080109/SN 2008D: Spectroscopic Evolution
  90. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum
  91. Konus-Wind observation of GRB 080122
  92. GRB 080122 : Suzaku WAM observation of the prompt emission
  93. GRB 080121: Swift/UVOT upper limits
  94. SNe 2008D and 2007uy: Chandra Detections
  95. GRB 080121 position was incorrect
  96. GRB 080121: Enhanced Swift-XRT position
  97. Two non-burst Swift SubThreshold triggers
  98. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  99. IPN triangulation of GRB080122
  100. GRB 080121: Nearby SDSS galaxies

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