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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"

21907 results found.

  1. Trigger 315630: Swift detection of a possible burst
  2. GRB 080701: Swift-XRT Prompt Analysis
  3. GRB 080623: Suzaku WAM observation of the prompt emission
  4. GRB 080625: Further observations from OSN
  5. GRB 080625:Swift-XRT detection of the afterglow
  6. GRB 080625: Observations at OSN
  7. GRB 080623: GROND upper limits
  8. GRB 080623, Swift-BAT refined analysis
  9. GRB 080623: Enhanced Swift-XRT position
  10. GRB 080623: TAROT La Silla observatory optical observations
  11. GRB 080623: Swift XRT prompt analysis
  12. GRB080607: optical observation
  13. GRB 070809: Putative host galaxy and redshift
  14. VLA upper limit on INTEGRAL burst GRB 080613A
  15. GRB080613B: MITSuME upper limits
  16. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  17. Konus-Wind observation of GRB 080613B
  18. GRB 080603A: optical observations on June 04
  19. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  20. GRB 080613B: GROND Upper Limits
  21. GRB 080613B - NOT optical and IR nondetections
  22. GRB080613B: Swift/UVOT Upper Limits
  23. GRB 080613B: Swift-XRT refined analysis
  24. GRB 080514B: Spectroscopic constraints and probable host galaxy
  25. GRB 080613B: Swift detection of a burst
  26. GRB 080613: Faulkes Telescope North optical candidate
  27. GRB 080603A: Late-time Keck imaging and spectroscopy
  28. GRB 080603b: optical observation
  29. GRB 080607: AGILE-MCAL observation of the prompt emission
  30. GRB 080603B - TLS 2nd Epoch: Another Break
  31. GRB 080605: TLS 3rd Epoch - Source Confusion
  32. GRB080605: optical observation with the MITSuME-OAO telescope
  33. Konus-Wind observation of GRB 080607
  34. GRB080607: RTT150 optical observations
  35. GRB 080603A: optical observations
  36. GRB 080607: Swift-XRT refined analysis
  37. GRB 080605: optical observations
  38. VLA detection of INTEGRAL burst GRB 080603A
  39. Konus-Wind observation of GRB 080605
  40. GRB 080607: Enhanced Swift-XRT position
  41. GRB 080607, Swift-BAT refined analysis
  42. GRB 080605: GROND 2nd epoch observations
  43. GRB 080607: Keck/LRIS spectroscopy and redshift
  44. GRB 080607: Swift detection of a burst with optical afterglow
  45. GRB 080605: Swift-UVOT refined analysis
  46. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  47. GRB 080604: VLA radio upper limit
  48. GRB 080605, Swift-BAT refined analysis
  49. GRB 080603B: VLA radio upper limit
  50. GRB 080605, Swift-BAT refined analysis
  51. GRB 080605: MASTER VWF 46 s AT observation
  52. GRB 080605: Enhanced Swift-XRT position
  53. GRB 080605: GROND detection of the optical afterglow candidate
  54. GRB 080605: Liverpool Telescope optical afterglow candidate
  55. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  56. GRB 080605: Swift detection of a burst with an optical afterglow
  57. GRB 080603B: TLS Afterglow Observation
  58. GRB 080603A: TLS Afterglow Observation
  59. GRB 080604: MITSuME Okayama observation
  60. GRB 080604: Swift-XRT refined analysis
  61. GRB 080603B : Liverpool Telescope Observations
  62. GRB 080603A: Swift-XRT detection of the afterglow
  63. GRB 080604: Enhanced Swift-XRT position
  64. GRB 080604: Early Super-LOTIS Observations
  65. GRB080604: confirmation of optical afterglow
  66. GRB 080604: Swift detection of a burst with an optical afterglow
  67. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  68. GRB 080516: TAROT La Silla observatory optical observations
  69. GRB080603B: NOT redshift
  70. GRB 080603B: BOOTES2/TELMA optical observations
  71. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  72. GRB 080603B: Swift detection of a burst with optical afterglow
  73. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  74. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  75. GRB 080602, Swift-BAT refined analysis
  76. GRB 080602: Swift-XRT refined analysis
  77. GRB 080602: NOT R-band upper limit
  78. GRB 080602: Enhanced Swift-XRT position
  79. GRB 080602: Swift detection of a burst
  80. Swift analysis of BAT Slew Survey event (Trigger=009)
  81. GRB 080523: afterglow confirmation and redshift constraints
  82. Konus-Wind observation of reactivation of SGR 1627-41
  83. GRB 080524: Swift XRT and UVOT analysis
  84. GRB 080503: 2nd Epoch Chandra X-ray Observations
  85. GRB 080523: VLT optical observations
  86. GRB 080523: Enhanced Swift-XRT position
  87. GRB 080523: Swift detection of a burst
  88. GRB 080515: KPNO 4m NIR afterglow detection
  89. GRB 80516: Swift/UVOT Observations
  90. GRB 080515: Swift-XRT position and analysis
  91. GRB 080514B: UVOT Observations
  92. GRB080520: Swift/UVOT observations
  93. GRB 080520, GROND observations
  94. GRB 080520: Enhanced Swift-XRT position
  95. GRB 080520: Swift XRT Refined Analysis
  96. GRB 080520: Swift detection of a burst with optical afterglow
  97. GRB 080514B: Suzaku WAM observation of the prompt emission
  98. Konus-Wind observation of GRB 080514B
  99. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  100. GRB 080514B: Further NIR observations

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