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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"

37682 results found.

  1. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  2. GRB 160705B: Swift/UVOT Upper Limits
  3. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  4. GRB 160705B: Swift-BAT refined analysis
  5. GRB 160623A: Astrosat CZTI detection
  6. GRB 160705B: Swift-XRT refined Analysis
  7. GRB 160705B: Enhanced Swift-XRT position
  8. GRB 160705B: LT optical candidate
  9. GRB 160705B: Swift detection of a burst
  10. GRB 160703A: Swift/UVOT Detection
  11. GRB 160703A: Swift-XRT afterglow detection
  12. GRB 160705A/MAXI J0748-149: MAXI/GSC detection
  13. GRB 160703A: MITSuME Ishigakijima Optical Observation
  14. GRB 160703A: MITSuME Akeno Optical Observations
  15. GRB 160625B: RTT150 optical observations
  16. GRB 160703A: Bassano Bresciano Observatory upper limits
  17. Konus-Wind observation of GRB 160703A
  18. GRB 160703A: Swift-BAT refined analysis
  19. GRB 160703A: Zadko observatory - Gingin optical observations
  20. GRB 160629A: AbAO optical observations
  21. GRB 160703A: Swift detection of a burst
  22. GRB 160629A: Swift/UVOT Upper Limits
  23. GRB 160625B: SAO RAS monitoring
  24. GRB 160629A: Swift-XRT afterglow detection
  25. GRB 160625B: LCOGT FTN observations
  26. GRB 160630A: Swift-BAT refined analysis
  27. GRB 160629A: Global MASTER Net Prompt OT observations
  28. GRB 160629A: Swift ToO observations
  29. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  30. Konus-Wind observation of GRB 160629A
  31. GRB 160630A: Zadko observatory - Gingin optical observations
  32. GRB 160630A: TAROT La Silla observatory optical observations
  33. GRB 160629A: BTA and GTC redshift
  34. GRB 160630A: Swift/UVOT Upper Limits
  35. GRB 160630A: Swift-XRT refined Analysis
  36. GRB 160625A: GROND upper limits
  37. GRB 160629A: Fermi GBM observation
  38. GRB 160630A: REM NIR observations
  39. GRB 160630A: Enhanced Swift-XRT position
  40. GRB 160630A: GROND Afterglow Detection
  41. GRB 160630A: Swift detection of a burst
  42. GRB 160629A: SAO RAS independent OT detection
  43. GRB 160629A: TAROT Calern observatory optical detection
  44. GRB 160629A: a long GBB detected by INTEGRAL
  45. GRB 160625B: TSHAO optical observations, correction GCN 19619
  46. GRB 160625B: TSHAO optical observations
  47. Konus-Wind observation of GRB 160620A
  48. GRB 160625B CALET Gamma-Ray Burst Monitor detection
  49. GRB 160625B: SMARTS optical/IR afterglow observations
  50. Pi of the Sky detection of an optical flash accompanying GRB 160625B
  51. GRB 160623A: SAO RAS optical observations
  52. Konus-Wind observation of a bright burst from SGR 1935+2154
  53. GRB 160625B: Global MASTER-Net prompt optical emission detection
  54. GRB 160625B: SAO RAS optical observations
  55. GRB 160625B: 15 GHz detection from AMI
  56. GRB 160623A: Possible detection of a radio afterglow at 15 GHz with AMI
  57. GRB 160601A: 15 GHz upper limits from AMI
  58. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  59. GRB 160625B: VLA Detection
  60. GRB 160625B: TSHAO optical observations
  61. Konus-Wind observation of GRB 160625B
  62. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  63. GRB 160625B: RATIR Optical and NIR Observations
  64. GRB 160625B: TNG redshift confirmation
  65. GRB 160625B: VLT/X-shooter redshift
  66. GRB 160625B: MITSuME Ishigakijima Optical Observation
  67. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  68. GRB 160623A CALET Gamma-Ray Burst Monitor detection
  69. IPN Triangulation of GRB 160620A (short/hard)
  70. GRB 160625A: Swift/UVOT Upper Limits
  71. GRB 160625A: Swift-BAT refined analysis
  72. GRB 160625A: Swift-XRT refined Analysis
  73. GRB 160625B: Swift/UVOT Detection
  74. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  75. GRB 160625B: Fermi GBM refined analysis
  76. GRB 160625B: Fermi-LAT refined analysis
  77. GRB 160625B: Swift-XRT afterglow detection
  78. GRB 160623A: SMA submm afterglow observations
  79. GRB 160625A: Enhanced Swift-XRT position
  80. GRB 160625B: Tiled Swift observations
  81. GRB 160625B: Fermi GBM initial observations
  82. GRB 160625B: Fermi-LAT detection of a bright burst
  83. GRB 160625A - two different events?
  84. GRB 160625A: Swift-XRT observations
  85. GRB 160625A: Swift detection of a burst
  86. GRB 160624A: Swift/UVOT Upper Limits
  87. GRB 160624A: Lulin observation
  88. GRB 160623A: TSHAO optical observations
  89. GRB 160624A: Swift-XRT refined Analysis
  90. GRB 160623A: MITSuME Ishigakijima Optical Observation
  91. GRB 160624A: MITSuME Ishigakijima upper limits
  92. GRB 160624A: Fermi GBM observation
  93. GRB 160624A, Swift-BAT refined analysis
  94. GRB 160623A: Swift/UVOT Upper Limits
  95. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  96. GRB 160624A: Enhanced Swift-XRT position
  97. GRB160624A:possible GRB host redshift
  98. GRB 160525B: 15 GHz upper limits from AMI
  99. GRB 160521B: 15 GHz upper limits from AMI
  100. GRB 160624A: Prompt enhanced Swift-XRT position

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