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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"

45845 results found.

  1. GRB 141225A: Enhanced Swift-XRT position
  2. GRB 141225A: Redshift from OSIRIS at the 10.4m GTC
  3. GRB 141225A: UVOT detection
  4. GRB 141225A: Optical aftergow confirmation
  5. GRB 141225A: LT optical candidate
  6. GRB 141225A: 1.23m CAHA optical observations
  7. GRB 141225A: Swift detection of a burst
  8. GRB 141221A: Keck spectroscopy
  9. GRB 141221A: TAROT La Silla observatory optical observations
  10. Swift XRT and UVOT observations of GRB141222A
  11. Konus-Wind observation of GRB 141222A
  12. GRB 141222A: First MASTER-SAAO optical observation
  13. IPN Triangulation of GRB 141222A (very intense)
  14. GRB 141221A: MITSuME Akeno upper limits
  15. GRB 141221A: Continued Skynet PROMPT-CTIO observations
  16. GRB 141222A: Fermi GBM detection
  17. GRB 141221A: Swift/UVOT Detection
  18. GRB 141222A: Fermi-LAT detection
  19. GRB 141215A: further Swift-XRT observations and afterglow detection
  20. GRB 141221A: Fermi GBM observation
  21. GRB 141220A: MITSuME Akeno upper limits
  22. GRB 141221A: Swift-XRT refined Analysis
  23. GRB 141221A: Swift-BAT refined analysis
  24. GRB141221A: GROND Afterglow Detection
  25. GRB 141221A: Enhanced Swift-XRT position
  26. GRB 141221A: Skynet PROMPT-CTIO observations of the optical afterglow
  27. GRB 141221A: LCOGT-McDonald optical afterglow observations
  28. GRB141221A: REM afterglow
  29. Konus-Wind observation of GRB 141220A
  30. GRB 141221A: Swift detection of a burst with an optical counterpart
  31. GRB 141220A: Fermi GBM observation
  32. GRB 141220A: MITSuME Okayama upper limits
  33. GRB 141220A: Swift-XRT refined Analysis
  34. GRB 141220A: Swift-BAT refined analysis
  35. GRB 141220A: Swift/UVOT Detection
  36. GRB 141220A: Photometry from OSIRIS/GTC
  37. GRB 141220A: LT optical afterglow observations
  38. GRB 141220A: Redshift from OSIRIS at the 10.4m GTC
  39. GRB141220A: 1.23m CAHA I-band observations
  40. GRB 141220A: Swift detection of a burst with an optical afterglow
  41. Fermi Gamma-ray Burst Monitor trigger 440728127 / 141220020 is not a GRB
  42. IPN Triangulation of GRB 141207A
  43. GRB 141207A: Suzaku WAM observation of the prompt emission
  44. GRB 141202A: Suzaku WAM observation of the prompt emission
  45. GRB 141121A: Keck observations
  46. GRB 141215A: Swift-XRT observations
  47. GRB 141215A: Fermi GBM detection
  48. GRB 141215A Tiled Swift observations
  49. Konus-Wind observation of GRB 141215A
  50. IPN Triangulation of GRB 141215A (long/intense)
  51. GRB 141212A iTelescope observation
  52. GRB 141212A: Zadko observatory - Gingin optical observations
  53. GRB 141212B: MITSuME Akeno upper limits
  54. Konus-Wind observation of GRB 141212B
  55. GRB 141212B: Swift-XRT refined Analysis
  56. GRB 141212A: Swift/UVOT Upper Limits
  57. GRB 141212B: Swift/UVOT Upper Limits
  58. GRB 141212A: VLA upper limit
  59. GRB 141212A: Gemini-N spectroscopy and photometry
  60. GRB 141212B: Swift-BAT refined analysis
  61. GRB 141212A: Swift-BAT refined analysis
  62. GRB 141212B: Enhanced Swift-XRT position
  63. Swift detection of 4U 1700+24 (= V934 Her)
  64. GRB 141212A: MITSuME Okayama upper limits
  65. GRB 141212A: Swift-XRT refined Analysis
  66. GRB 141212A: extended object within the XRT error circle
  67. GRB141212A: xinglong TNT upper limit
  68. GRB 141212A: Khureltogot optical upper limit
  69. GRB 141212A: 1.23m CAHA I-band observations
  70. GRB 141212B: initial Swift/UVOT observations
  71. GRB 141212B: Swift/XRT preliminary localization
  72. GRB 141212A: Enhanced Swift-XRT position
  73. GRB 141212A: Correction to GCN 17162
  74. GRB 141212A: MASTER early optical observations
  75. GRB 141212A: Skynet R-COP Observations
  76. GRB 141212A: MITSuME Akeno upper limits
  77. GRB 141212B: Swift detection of a burst
  78. GRB 141212A: Swift detection of a short burst
  79. GRB 141207A: Swift-XRT afterglow candidate detection
  80. GRB 141121A: further VLA observations
  81. Konus-Wind observation of GRB 141207A
  82. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  83. GRB141202A: Discovery Channel Telescope Optical Observations
  84. GRB141207A: Discovery Channel Telescope Optical Observations
  85. GRB 141207A: Swift-UVOT Observations
  86. GRB 141207A: Fermi GBM detection
  87. GRB 141207A: Swift-XRT observations
  88. Konus-Wind observation of GRB 141130A
  89. GRB 141207A Tiled Swift observations
  90. GRB 141207A: Fermi-LAT Detection
  91. GRB141121A: Discovery Channel Telescope Optical Observations
  92. GRB 141205A: Swift/UVOT Upper Limits
  93. GRB 141205A: Fermi GBM detection
  94. GRB 141205A: Nanshan optical upper limit
  95. GRB 141205A: XRT observations
  96. GRB 141205A Swift-BAT refined analysis
  97. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  98. GRB 141121A: Mondy optical observations
  99. GRB 141205A Short hard GRB found in ground analysis of BAT data
  100. Konus-Wind observation of GRB 141202A

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