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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"

16277 results found.

  1. GRB 150203A: RATIR Optical and NIR Observations
  2. GRB 150203A: KAIT Optical Upper Limit
  3. GRB 150201A: Swift/UVOT Upper Limits
  4. GRB 150120B: Khureltogot optical observations
  5. GRB 150128A: MASTER OT detction during inspection
  6. GRB 150120A: Gemini-N imaging and host redshift
  7. GRB 150123A: Swift/UVOT observations
  8. GRB 150123A: Swift-XRT observations
  9. GRB 150120B: Mondy optical observations
  10. GRB 150120B: RATIR Optical and NIR Observations
  11. GRB 150120A: ISON-NM early optical limit
  12. GRB 150120B: FTN early optical light curve
  13. GRB150120B: Xinglong TNT optical observation
  14. GRB 150120B: Swift/UVOT Upper Limits
  15. GRB 150120B, Optical observations
  16. GRB 150120B: Additional P60 observations
  17. GRB 150101B: Confirmation of a fading optical counterpart
  18. GRB 150120A: KAIT Optical Upper Limit
  19. GRB 150120B: MITSuME Okayama upper limits
  20. GRB 150101B/Swift J123205.1-105602: TNG NIR follow-up
  21. GRB 150120A: Swift/UVOT Upper Limits
  22. GRB 150101B/Swift J123205.1-105602, deep VLT observations
  23. GRB 150120B: FTN optical afterglow confirmation
  24. GRB 150120B: P60 optical afterglow
  25. GRB 150120A: Gemini-North optical imaging
  26. GRB 150120A: P60 optical observations
  27. GRB 150101B/Swift J123205.1-105602: continued WSRT radio and VLT optical observations
  28. GRB 150110B: Khureltogot optical upper limit
  29. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  30. GRB 150110C: Swift/UVOT Upper Limits
  31. GRB 150110A: MASTER inspection
  32. GRB 150110B: Swift/UVOT Upper Limits
  33. GRB 150101B/Swift J123205.1-105602: Chandra observations
  34. GRB 150101B / Swift J123205.1-105602: 9.8 GHz VLA observations
  35. GRB 150101B/Swift J123205.1-105602: WSRT radio observation
  36. GRB 150101B / Swift J123205.1-105602: X-ray counterpart is likely an AGN
  37. GRB 150101B/Swift J123205.1-105602: VLT observations and redshift
  38. GRB 150103A: MASTER optical observations
  39. GRB 150101B: potential host galaxy redshift by GTC
  40. GRB 150103A: Swift/UVOT Upper Limits
  41. GRB 150103A: Zadko observatory - Gingin optical observations
  42. Swift J123205.1-105602: Magellan candidate afterglow
  43. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  44. GRB 150101A: Swift/UVOT Upper Limits
  45. GRB 141229A: Deep MASTER inspection
  46. Swift-XRT and UVOT follow-up of iPTF14jko (GRB 141230A)
  47. GRB 141230A: Nanshan optical obsrvations
  48. GRB 141230A: iPTF Optical Observations and Candidate Afterglow iPTF14jko
  49. GRB 141229A: 1.23m CAHA optical observations
  50. GRB 141229A: Nanshan optical upper limit
  51. GRB 141225A: MITSuME Okayama upper limits
  52. GRB 141225A: TAROT Calern observatory optical observations
  53. GRB 141225A: Swift/UVOT refined analysis
  54. GRB 141225A: Fermi GBM detection
  55. GRB 141225A: MASTER-SAAO first OT detection
  56. GRB 141225A: Nanshan very early optical observations
  57. GRB 141225A: Optical aftergow confirmation
  58. GRB 141225A: LT optical candidate
  59. GRB 141225A: 1.23m CAHA optical observations
  60. GRB 141221A: Keck spectroscopy
  61. GRB 141221A: TAROT La Silla observatory optical observations
  62. Swift XRT and UVOT observations of GRB141222A
  63. GRB 141222A: First MASTER-SAAO optical observation
  64. GRB 141221A: MITSuME Akeno upper limits
  65. GRB 141221A: Continued Skynet PROMPT-CTIO observations
  66. GRB 141215A: further Swift-XRT observations and afterglow detection
  67. GRB 141220A: MITSuME Akeno upper limits
  68. GRB141221A: GROND Afterglow Detection
  69. GRB 141221A: Skynet PROMPT-CTIO observations of the optical afterglow
  70. GRB 141221A: LCOGT-McDonald optical afterglow observations
  71. GRB141221A: REM afterglow
  72. GRB 141221A: Swift detection of a burst with an optical counterpart
  73. GRB 141220A: MITSuME Okayama upper limits
  74. GRB 141220A: Swift/UVOT Detection
  75. GRB 141220A: LT optical afterglow observations
  76. GRB 141220A: Swift detection of a burst with an optical afterglow
  77. GRB 141121A: Keck observations
  78. GRB 141212A iTelescope observation
  79. GRB 141212A: Zadko observatory - Gingin optical observations
  80. GRB 141212B: MITSuME Akeno upper limits
  81. GRB 141212A: Swift/UVOT Upper Limits
  82. GRB 141212B: Swift/UVOT Upper Limits
  83. GRB 141212A: MITSuME Okayama upper limits
  84. GRB 141212A: extended object within the XRT error circle
  85. GRB141212A: xinglong TNT upper limit
  86. GRB 141212A: Khureltogot optical upper limit
  87. GRB 141212A: MASTER early optical observations
  88. GRB 141212A: Skynet R-COP Observations
  89. GRB 141212A: MITSuME Akeno upper limits
  90. GRB 141207A: Swift-XRT afterglow candidate detection
  91. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  92. GRB141202A: Discovery Channel Telescope Optical Observations
  93. GRB141207A: Discovery Channel Telescope Optical Observations
  94. GRB 141207A: Swift-UVOT Observations
  95. GRB141121A: Discovery Channel Telescope Optical Observations
  96. GRB 141205A: Nanshan optical upper limit
  97. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  98. GRB 141121A: Mondy optical observations
  99. GRB 141130A: Mondy optical observations
  100. GRB 141130A: Mondy optical light curve

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