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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"

23575 results found.

  1. GRB 110128A: Afterglow detection from NOT
  2. GRB 110128A: TAROT Calern observatory upper limits
  3. GRB 110128A: Swift detection of a burst
  4. GRB 110123A: Fermi GBM detection
  5. GRB 110106B, radio observations
  6. GRB 110120A: MASTER optical observations
  7. IPN triangulation of GRB 110120A
  8. GRB 101225A: CQUEAN optical observation
  9. GRB 110106A: CrAO optical observations
  10. GRB 110120A: Fermi GBM detection
  11. GRB 110112A: optical upper limit
  12. GRB110119: Swift/UVOT Detection
  13. GRB110119A: MITSuME Okayama optical upper limits
  14. GRB 110119A: Swift-BAT refined analysis
  15. GRB 110119A: PAIRITEL NIR Afterglow Detection
  16. GRB 110119A: Enhanced Swift-XRT position
  17. GRB 110119A: Swift detection of a burst with an optical detection
  18. GRB 101219B: GROND detection of a SN signature
  19. Swift-BAT trigger 442771 is a noise fluctuation
  20. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  21. New feature in Fermi GBM GRB Ground Position Notices
  22. Swift-BAT Trigger 442539 is not a GRB
  23. Swift Trigger 442539 is probably not a GRB
  24. Short GRB 110112B : early optical limit by "Pi of the Sky"
  25. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  26. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  27. GRB 110107A: Swift-XRT afterglow confirmation
  28. GRB 110112A: Swift/UVOT upper limits
  29. GRB 110112A: WHT candidate afterglow/host galaxy
  30. GRB 110112A: Enhanced Swift-XRT position
  31. GRB 110112A: Swift detection of a possible short burst
  32. GRB 110107A: Swift/UVOT upper limits
  33. GRB 101225a
  34. GRB 101219b. Possible radio afterglow detection.
  35. GRB 110107A: Swift-XRT Afterglow Candidate
  36. GRB 110107A detected in ground analysis of BAT slew data
  37. GRB 110106A: TNG NIR observations
  38. GRB 110106A: ISAS-Kanazawa optical upper limit
  39. GRB 110106A: MITSuME Okayama optical upper limits
  40. GRB 110106B: WHT candidate afterglow
  41. GRB 110106B: Swift-BAT refined analysis
  42. GRB 110106B: Enhanced Swift-XRT position
  43. GRB 110106A: Swift/UVOT Upper Limits
  44. GRB110106B: Xinglong TNT upper limit
  45. GRB 110106A: Enhanced Swift-XRT position
  46. GRB 110106B: Swift detection of a burst
  47. GRB 110106A: TNG optical observations and candidate counterparts
  48. GRB110106A: Xinglong TNT upper limit
  49. GRB 110106A: Swift detection of a burst
  50. GRB 101225A: Host galaxy
  51. GRB110102A: Swift/UVOT observations
  52. GRB110102A: MITSuME Okayama Optical Observation
  53. GRB 110102A: Enhanced Swift-XRT position
  54. GRB 110102A: Swift detection of a burst with an optical detection
  55. GRB 101225A: P60 Observations
  56. GRB 101225A: MAXI/GSC observations
  57. GRB 101225A Late-time emission observed by Swift-BAT
  58. GRB 101225A, Swift-BAT refined analysis
  59. GRB 101225A: Swift/UVOT Detection
  60. GRB 101225A: Enhanced Swift-XRT position
  61. Trigger 441015 / GRB 101225A: Further NOT optical observation
  62. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  63. GRB 101225A (Swift trigger 441015): optical upper limit
  64. Trigger 441015: Swift detection of a possible burst or transient
  65. GRB 101224A: NOT optical observation
  66. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  67. GRB 101224A: Swift/UVOT Upper Limits
  68. GRB 101224A: Swift-XRT refined Analysis
  69. GRB101224A: MITSuME Okayama optical upper limits
  70. GRB 101224A - UVOT-enhanced XRT position
  71. GRB 101224A: Swift detection of a short burst
  72. GRB 101219A: Chandra Observations
  73. GRB 101219B: Swift/UVOT refined analysis
  74. GRB 101219B: Enhanced Swift-XRT position
  75. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  76. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  77. GRB 101219A: IAC80 optical observations
  78. GRB 101219B: Swift detection of a burst with an optical afterglow
  79. GRB 101219A: Swift/UVOT Upper Limits
  80. GRB 101219A: GROND Upper limits
  81. GRB 101219A: Magellan NIR observations
  82. GRB 101219A: Further Gemini-South Imaging
  83. GRB 101219A - NOT observation - upper limit
  84. GRB 101219A: SARA-N Upper Limit
  85. GRB 101219A: REM optical and NIR observations
  86. GRB 101219A: ROTSE-III Optical Limits
  87. GRB 101219A: Swift detection of a short hard burst
  88. GRB 101213A : Suzaku WAM observation of the prompt emission
  89. Redshift solution(s) for GRB101213A from Swift-XRT data
  90. XRF 101117A, RIMOTS optical upper limits
  91. GRB 101213A: Swift/UVOT Upper Limits
  92. GRB 101213A: Enhanced Swift-XRT position
  93. GRB 101213: object within the X-ray error circle
  94. GRB 101213A: Swift detection of a burst
  95. GRB101204A: Swift/UVOT observations
  96. GRB 101204A: Swift-XRT refined Analysis
  97. GRB101204A GROND Detection of the Optical/NIR Afterglow
  98. GRB 101204A Afterglow Candidate, VATT Observations
  99. GRB 101204A Swift-XRT/UVOT afterglow candidate
  100. IPN Localization of GRB101130 (possible short duration burst)

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