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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"

45847 results found.

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

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