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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"

28261 results found.

  1. GRB 110112A: optical upper limit
  2. GRB110119: Swift/UVOT Detection
  3. GRB 110119A: Swift-XRT refined Analysis
  4. GRB110119A: MITSuME Okayama optical upper limits
  5. GRB 110119A: Swift-BAT refined analysis
  6. GRB 110119A: PAIRITEL NIR Afterglow Detection
  7. GRB 110119A: Enhanced Swift-XRT position
  8. GRB 110119A: Swift detection of a burst with an optical detection
  9. GRB110106A, mm-radio observations
  10. GRB 101219B: GROND detection of a SN signature
  11. Swift-BAT trigger 442771 is a noise fluctuation
  12. New feature in Fermi GBM GRB Ground Position Notices
  13. Swift-BAT Trigger 442539 is not a GRB
  14. Swift Trigger 442539 is probably not a GRB
  15. Short GRB 110112B : early optical limit by "Pi of the Sky"
  16. GRB101225A - timing analysis
  17. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  18. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  19. GRB 110107A: Swift-XRT afterglow confirmation
  20. GRB 101225A: HST observations - no host detected
  21. GRB 110112A: Swift-XRT refined Analysis
  22. GRB 110112A: Swift/UVOT upper limits
  23. GRB 110112A: WHT candidate afterglow/host galaxy
  24. GRB 110112A: Swift-BAT refined analysis
  25. GRB 110112A: Enhanced Swift-XRT position
  26. GRB110112A: TNT optical afterglow candidate
  27. GRB 110112A: Swift detection of a possible short burst
  28. GRB 110107A: Swift/UVOT upper limits
  29. GRB 101219b. Possible radio afterglow detection.
  30. GRB 110107A: Swift-XRT Afterglow Candidate
  31. GRB 110106B: Fermi GBM detection
  32. GRB 110106B: Swift-XRT refined Analysis
  33. GRB 110106A: TNG NIR observations
  34. GRB 110106A: ISAS-Kanazawa optical upper limit
  35. GRB 110106A: MITSuME Okayama optical upper limits
  36. GRB 110106B: Swift-BAT refined analysis
  37. GRB 110106B: Enhanced Swift-XRT position
  38. GRB 110106A: Swift/UVOT Upper Limits
  39. GRB 110106A: TNG redshift of the closeby galaxy
  40. GRB 110106A: Swift-XRT refined Analysis
  41. GRB 110106A: Swift-BAT refined analysis
  42. GRB 110106A: Enhanced Swift-XRT position
  43. GRB 110106B: Swift detection of a burst
  44. GRB 110106A: TNG optical observations and candidate counterparts
  45. GRB 110106A: Swift detection of a burst
  46. GRB 101225A: Host galaxy
  47. GRB 110102A: Swift-XRT refined Analysis
  48. GRB110102A: Swift/UVOT observations
  49. GRB110102A: MITSuME Okayama Optical Observation
  50. GRB 110102A: Fermi GBM observation
  51. GRB 110102A: Swift-BAT refined analysis
  52. GRB 110102A: Enhanced Swift-XRT position
  53. GRB 110102A: Swift detection of a burst with an optical detection
  54. GRB 101225A: optical break from NOT observation
  55. GRB 101225A: P60 Observations
  56. GRB 101225A: MAXI/GSC observations
  57. GRB 101225A Late-time emission observed by Swift-BAT
  58. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  59. GRB 101225A, Swift-BAT refined analysis
  60. GRB 101225A: Swift/UVOT Detection
  61. GRB 101225A: Swift-XRT refined Analysis
  62. GRB 101225A: Enhanced Swift-XRT position
  63. Trigger 441015 / GRB 101225A: Further NOT optical observation
  64. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  65. GRB 101225A (Swift trigger 441015): optical upper limit
  66. Trigger 441015: Swift detection of a possible burst or transient
  67. GRB 101224A: NOT optical observation
  68. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  69. GRB 101224A: Swift/UVOT Upper Limits
  70. GRB 101224A: Swift-XRT refined Analysis
  71. GRB101224A: MITSuME Okayama optical upper limits
  72. GRB 101224A, Swift-BAT refined analysis
  73. GRB 101224A - UVOT-enhanced XRT position
  74. GRB 101224A: Swift detection of a short burst
  75. GRB 101219A: Chandra Observations
  76. GRB 101219B: Swift/UVOT refined analysis
  77. GRB 101219B: Swift-XRT refined Analysis
  78. GRB 101219B: Enhanced Swift-XRT position
  79. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  80. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  81. GRB 101219B: Fermi GBM observation
  82. GRB 101219A: IAC80 optical observations
  83. GRB 101219B: Swift-BAT refined analysis
  84. GRB 101219A: Swift-XRT refined Analysis
  85. GRB 101219B: Swift detection of a burst with an optical afterglow
  86. GRB 101219A: Swift/UVOT Upper Limits
  87. GRB 101219A: GROND Upper limits
  88. GRB 101219A: Magellan NIR observations
  89. GRB 101219A: Further Gemini-South Imaging
  90. GRB 101219A: Swift-BAT refined analysis
  91. GRB 101219A - NOT observation - upper limit
  92. GRB 101219A: SARA-N Upper Limit
  93. GRB 101219A: REM optical and NIR observations
  94. GRB 101219A: Swift detection of a short hard burst
  95. GRB 101213A : Suzaku WAM observation of the prompt emission
  96. Redshift solution(s) for GRB101213A from Swift-XRT data
  97. XRF 101117A, RIMOTS optical upper limits
  98. GRB 101213A: Fermi GBM observation
  99. GRB 101213A, Swift-BAT refined analysis
  100. GRB 101213A: Swift-XRT refined Analysis

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