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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"

45661 results found.

  1. GRB110119: Swift/UVOT Detection
  2. GRB 110119A: Swift-XRT refined Analysis
  3. GRB110119A: MITSuME Okayama optical upper limits
  4. GRB 110119A: Swift-BAT refined analysis
  5. GRB 110119A: PAIRITEL NIR Afterglow Detection
  6. GRB 110119A: Enhanced Swift-XRT position
  7. GRB 110119A: Swift detection of a burst with an optical detection
  8. GRB110106A, mm-radio observations
  9. GRB 101219B: tentative redshift and spectroscopic supernova detection
  10. GRB 101219B: GROND detection of a SN signature
  11. Swift-BAT trigger 442771 is a noise fluctuation
  12. GRB 101219B: correction
  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. GRB101225A - timing analysis
  19. GRB 110112B: Fermi GBM observation
  20. The Christmas burst GRB 101225A - optical spectroscopy with GTC
  21. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  22. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  23. GRB 110107A: Swift-XRT afterglow confirmation
  24. GRB 101225A: HST observations - no host detected
  25. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  26. GRB 110112B: A short GRB detected by INTEGRAL
  27. GRB 110112A: Swift-XRT refined Analysis
  28. GRB 110112A: Swift/UVOT upper limits
  29. GRB 110112A: WHT candidate afterglow/host galaxy
  30. GRB 110112A: MASTER optical observations
  31. GRB 110112A: Swift-BAT refined analysis
  32. GRB 110112A: Enhanced Swift-XRT position
  33. GRB 110106B: MASTER optical observations
  34. GRB110112A: TNT optical afterglow candidate
  35. GRB 110112A: Swift detection of a possible short burst
  36. GRB 110106B: early optical and near-IR observations
  37. GRB 110107A: Swift/UVOT upper limits
  38. GRB 101225a
  39. GRB 101219b. Possible radio afterglow detection.
  40. GRB 110106B: MASTER early optical observations
  41. GRB 110107A: Swift-XRT Afterglow Candidate
  42. GRB 110107A: Swift-BAT refined analysis
  43. GRB 110107A detected in ground analysis of BAT slew data
  44. GRB 101213A: Gemini-N galaxy redshift
  45. GRB 110106B: Fermi GBM detection
  46. Short GRB 110106A: MASTER OT observations
  47. GRB 110106B: Swift-XRT refined Analysis
  48. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  49. GRB 110106A: TNG NIR observations
  50. GRB 110106B Gemini-N galaxy redshift
  51. GRB 110106B: Liverpool Telescope observations
  52. GRB 110106A: ISAS-Kanazawa optical upper limit
  53. GRB 110106A: MITSuME Okayama optical upper limits
  54. GRB 110106B: WHT candidate afterglow
  55. GRB 110106B: Swift-BAT refined analysis
  56. GRB 110106B: Enhanced Swift-XRT position
  57. GRB 110106A: Swift/UVOT Upper Limits
  58. GRB 110106A: TNG redshift of the closeby galaxy
  59. GRB 110106A: Swift-XRT refined Analysis
  60. GRB110106B: Xinglong TNT upper limit
  61. GRB 110106A: Swift-BAT refined analysis
  62. GRB 110106A: Enhanced Swift-XRT position
  63. GRB 110106B: Swift detection of a burst
  64. GRB 110106A: TNG optical observations and candidate counterparts
  65. GRB 110106A: MASTER optical observations
  66. GRB 101225A: Keck redshift
  67. GRB110106A: Xinglong TNT upper limit
  68. GRB 110106A: Swift detection of a burst
  69. GRB 101225A: Host galaxy
  70. GRB 101219A: Gemini-North host redshift
  71. GRB 110102A: Swift-XRT refined Analysis
  72. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  73. Konus-Wind observation of GRB 110102A
  74. GRB110102A: Swift/UVOT observations
  75. GRB110102A: MITSuME Okayama Optical Observation
  76. GRB 110102A: Fermi GBM observation
  77. GRB 110102A: Swift-BAT refined analysis
  78. GRB 110102A: Enhanced Swift-XRT position
  79. GRB 110102A: Swift detection of a burst with an optical detection
  80. GRB 101225A: optical break from NOT observation
  81. GRB 101225A: MMT spectroscopy
  82. GRB 101225A: P60 Observations
  83. GRB 101225A: MAXI/GSC observations
  84. GRB 101225A Late-time emission observed by Swift-BAT
  85. GRB 101225: Optical follow-up of the Christmas burst
  86. GRB 101225A: WHT observations
  87. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  88. GRB 101225A, Swift-BAT refined analysis
  89. GRB 101225A: Swift/UVOT Detection
  90. GRB 101225A: Swift-XRT refined Analysis
  91. GRB 101225A: Enhanced Swift-XRT position
  92. Trigger 441015 / GRB 101225A: Further NOT optical observation
  93. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  94. GRB 101225A (Swift trigger 441015): optical upper limit
  95. Trigger 441015: Swift detection of a possible burst or transient
  96. GRB 101224A: NOT optical observation
  97. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  98. GRB 101224A: Swift/UVOT Upper Limits
  99. GRB 101224A: Fermi GBM observation
  100. GRB 101224A: Swift-XRT refined Analysis

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