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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"

23468 results found.

  1. GRB 101225A: CQUEAN optical observation
  2. GRB 110106A: CrAO optical observations
  3. GRB 110120A: Fermi GBM detection
  4. GRB 110112A: optical upper limit
  5. GRB110119: Swift/UVOT Detection
  6. GRB110119A: MITSuME Okayama optical upper limits
  7. GRB 110119A: Swift-BAT refined analysis
  8. GRB 110119A: PAIRITEL NIR Afterglow Detection
  9. GRB 110119A: Enhanced Swift-XRT position
  10. GRB 110119A: Swift detection of a burst with an optical detection
  11. GRB 101219B: GROND detection of a SN signature
  12. Swift-BAT trigger 442771 is a noise fluctuation
  13. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  14. New feature in Fermi GBM GRB Ground Position Notices
  15. Swift-BAT Trigger 442539 is not a GRB
  16. Swift Trigger 442539 is probably not a GRB
  17. Short GRB 110112B : early optical limit by "Pi of the Sky"
  18. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  19. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  20. GRB 110107A: Swift-XRT afterglow confirmation
  21. GRB 110112A: Swift/UVOT upper limits
  22. GRB 110112A: WHT candidate afterglow/host galaxy
  23. GRB 110112A: Enhanced Swift-XRT position
  24. GRB 110112A: Swift detection of a possible short burst
  25. GRB 110107A: Swift/UVOT upper limits
  26. GRB 101225a
  27. GRB 101219b. Possible radio afterglow detection.
  28. GRB 110107A: Swift-XRT Afterglow Candidate
  29. GRB 110107A detected in ground analysis of BAT slew data
  30. GRB 110106A: TNG NIR observations
  31. GRB 110106A: ISAS-Kanazawa optical upper limit
  32. GRB 110106A: MITSuME Okayama optical upper limits
  33. GRB 110106B: WHT candidate afterglow
  34. GRB 110106B: Swift-BAT refined analysis
  35. GRB 110106B: Enhanced Swift-XRT position
  36. GRB 110106A: Swift/UVOT Upper Limits
  37. GRB110106B: Xinglong TNT upper limit
  38. GRB 110106A: Enhanced Swift-XRT position
  39. GRB 110106B: Swift detection of a burst
  40. GRB 110106A: TNG optical observations and candidate counterparts
  41. GRB110106A: Xinglong TNT upper limit
  42. GRB 110106A: Swift detection of a burst
  43. GRB 101225A: Host galaxy
  44. GRB110102A: Swift/UVOT observations
  45. GRB110102A: MITSuME Okayama Optical Observation
  46. GRB 110102A: Enhanced Swift-XRT position
  47. GRB 110102A: Swift detection of a burst with an optical detection
  48. GRB 101225A: P60 Observations
  49. GRB 101225A: MAXI/GSC observations
  50. GRB 101225A Late-time emission observed by Swift-BAT
  51. GRB 101225A, Swift-BAT refined analysis
  52. GRB 101225A: Swift/UVOT Detection
  53. GRB 101225A: Enhanced Swift-XRT position
  54. Trigger 441015 / GRB 101225A: Further NOT optical observation
  55. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  56. GRB 101225A (Swift trigger 441015): optical upper limit
  57. Trigger 441015: Swift detection of a possible burst or transient
  58. GRB 101224A: NOT optical observation
  59. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  60. GRB 101224A: Swift/UVOT Upper Limits
  61. GRB 101224A: Swift-XRT refined Analysis
  62. GRB101224A: MITSuME Okayama optical upper limits
  63. GRB 101224A - UVOT-enhanced XRT position
  64. GRB 101224A: Swift detection of a short burst
  65. GRB 101219A: Chandra Observations
  66. GRB 101219B: Swift/UVOT refined analysis
  67. GRB 101219B: Enhanced Swift-XRT position
  68. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  69. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  70. GRB 101219A: IAC80 optical observations
  71. GRB 101219B: Swift detection of a burst with an optical afterglow
  72. GRB 101219A: Swift/UVOT Upper Limits
  73. GRB 101219A: GROND Upper limits
  74. GRB 101219A: Magellan NIR observations
  75. GRB 101219A: Further Gemini-South Imaging
  76. GRB 101219A - NOT observation - upper limit
  77. GRB 101219A: SARA-N Upper Limit
  78. GRB 101219A: REM optical and NIR observations
  79. GRB 101219A: ROTSE-III Optical Limits
  80. GRB 101219A: Swift detection of a short hard burst
  81. GRB 101213A : Suzaku WAM observation of the prompt emission
  82. Redshift solution(s) for GRB101213A from Swift-XRT data
  83. XRF 101117A, RIMOTS optical upper limits
  84. GRB 101213A: Swift/UVOT Upper Limits
  85. GRB 101213A: Enhanced Swift-XRT position
  86. GRB 101213: object within the X-ray error circle
  87. GRB 101213A: Swift detection of a burst
  88. GRB101204A: Swift/UVOT observations
  89. GRB 101204A: Swift-XRT refined Analysis
  90. GRB101204A GROND Detection of the Optical/NIR Afterglow
  91. GRB 101204A Afterglow Candidate, VATT Observations
  92. GRB 101204A Swift-XRT/UVOT afterglow candidate
  93. IPN Localization of GRB101130 (possible short duration burst)
  94. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  95. GRB 101201A: Fermi GBM observation
  96. GRB 101201A: Swift-XRT refined Analysis
  97. GRB 101201A: Swift/UVOT Detection
  98. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  99. GRB 101201A detected in ground analysis of BAT data
  100. Swift detection of MAXIJ1409-619

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