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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"

37266 results found.

  1. GRB110119A: MITSuME Okayama optical upper limits
  2. GRB 110119A: Swift-BAT refined analysis
  3. GRB 110119A: PAIRITEL NIR Afterglow Detection
  4. GRB 110119A: Enhanced Swift-XRT position
  5. GRB 110119A: Swift detection of a burst with an optical detection
  6. GRB110106A, mm-radio observations
  7. GRB 101219B: tentative redshift and spectroscopic supernova detection
  8. GRB 101219B: GROND detection of a SN signature
  9. GRB 101219B: correction
  10. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  11. New feature in Fermi GBM GRB Ground Position Notices
  12. Swift-BAT Trigger 442539 is not a GRB
  13. Swift Trigger 442539 is probably not a GRB
  14. Short GRB 110112B : early optical limit by "Pi of the Sky"
  15. GRB101225A - timing analysis
  16. GRB 110112B: Fermi GBM observation
  17. The Christmas burst GRB 101225A - optical spectroscopy with GTC
  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 101225A: HST observations - no host detected
  22. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  23. GRB 110112B: A short GRB detected by INTEGRAL
  24. GRB 110112A: Swift-XRT refined Analysis
  25. GRB 110112A: Swift/UVOT upper limits
  26. GRB 110112A: WHT candidate afterglow/host galaxy
  27. GRB 110112A: MASTER optical observations
  28. GRB 110112A: Swift-BAT refined analysis
  29. GRB 110112A: Enhanced Swift-XRT position
  30. GRB 110106B: MASTER optical observations
  31. GRB110112A: TNT optical afterglow candidate
  32. GRB 110112A: Swift detection of a possible short burst
  33. GRB 110106B: early optical and near-IR observations
  34. GRB 110107A: Swift/UVOT upper limits
  35. GRB 101225a
  36. GRB 101219b. Possible radio afterglow detection.
  37. GRB 110106B: MASTER early optical observations
  38. GRB 110107A: Swift-XRT Afterglow Candidate
  39. GRB 110107A: Swift-BAT refined analysis
  40. GRB 110107A detected in ground analysis of BAT slew data
  41. GRB 101213A: Gemini-N galaxy redshift
  42. GRB 110106B: Fermi GBM detection
  43. Short GRB 110106A: MASTER OT observations
  44. GRB 110106B: Swift-XRT refined Analysis
  45. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  46. GRB 110106A: TNG NIR observations
  47. GRB 110106B Gemini-N galaxy redshift
  48. GRB 110106B: Liverpool Telescope observations
  49. GRB 110106A: ISAS-Kanazawa optical upper limit
  50. GRB 110106A: MITSuME Okayama optical upper limits
  51. GRB 110106B: WHT candidate afterglow
  52. GRB 110106B: Swift-BAT refined analysis
  53. GRB 110106B: Enhanced Swift-XRT position
  54. GRB 110106A: Swift/UVOT Upper Limits
  55. GRB 110106A: TNG redshift of the closeby galaxy
  56. GRB 110106A: Swift-XRT refined Analysis
  57. GRB110106B: Xinglong TNT upper limit
  58. GRB 110106A: Swift-BAT refined analysis
  59. GRB 110106A: Enhanced Swift-XRT position
  60. GRB 110106B: Swift detection of a burst
  61. GRB 110106A: TNG optical observations and candidate counterparts
  62. GRB 110106A: MASTER optical observations
  63. GRB 101225A: Keck redshift
  64. GRB110106A: Xinglong TNT upper limit
  65. GRB 110106A: Swift detection of a burst
  66. GRB 101225A: Host galaxy
  67. GRB 101219A: Gemini-North host redshift
  68. GRB 110102A: Swift-XRT refined Analysis
  69. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  70. Konus-Wind observation of GRB 110102A
  71. GRB110102A: Swift/UVOT observations
  72. GRB110102A: MITSuME Okayama Optical Observation
  73. GRB 110102A: Fermi GBM observation
  74. GRB 110102A: Swift-BAT refined analysis
  75. GRB 110102A: Enhanced Swift-XRT position
  76. GRB 110102A: Swift detection of a burst with an optical detection
  77. GRB 101225A: optical break from NOT observation
  78. GRB 101225A: MMT spectroscopy
  79. GRB 101225A: P60 Observations
  80. GRB 101225A: MAXI/GSC observations
  81. GRB 101225A Late-time emission observed by Swift-BAT
  82. GRB 101225: Optical follow-up of the Christmas burst
  83. GRB 101225A: WHT observations
  84. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  85. GRB 101225A, Swift-BAT refined analysis
  86. GRB 101225A: Swift/UVOT Detection
  87. GRB 101225A: Swift-XRT refined Analysis
  88. GRB 101225A: Enhanced Swift-XRT position
  89. Trigger 441015 / GRB 101225A: Further NOT optical observation
  90. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  91. GRB 101225A (Swift trigger 441015): optical upper limit
  92. Trigger 441015: Swift detection of a possible burst or transient
  93. GRB 101224A: NOT optical observation
  94. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  95. GRB 101224A: Swift/UVOT Upper Limits
  96. GRB 101224A: Fermi GBM observation
  97. GRB 101224A: Swift-XRT refined Analysis
  98. GRB101224A: MITSuME Okayama optical upper limits
  99. GRB 101224A, Swift-BAT refined analysis
  100. GRB 101224A - UVOT-enhanced XRT position

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