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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"

43014 results found.

  1. GRB 101008A: Swift-XRT refined analysis
  2. GRB 101008A: SAO RAS optical observations
  3. GRB 100915 optical upper limit
  4. GRB 101008: Swift/UVOT Upper Limits
  5. GRB 101008A: Enhanced Swift-XRT position
  6. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  7. GRB 101008A: Swift detection of a burst
  8. GRB 100728B: X-shooter redshift
  9. Refined analysis shows Swift Trigger 435520 is not a GRB
  10. Swift Trigger 435520 is probably not a GRB
  11. GRB 100925A / MAXI J1659-152: MASTER optical observations
  12. GRB 100924A: Suzaku WAM observation of the prompt emission
  13. GRB 100924A: Fermi GBM observation
  14. GRB 100928A: Swift detection of a burst
  15. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  16. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  17. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  18. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  19. GRB 100925A / MAXI J1659-152: SARA-S Observations
  20. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  21. GRB 100925A/MAXI J1659-152 - NOT optical observations
  22. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  23. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  24. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  25. GRB 100924A: GROND detection of an optical/NIR afterglow
  26. GRB 100925A: Swift detection of a burst
  27. GRB 100924A: Swift-BAT refined analysis
  28. GRB 100924A: Swift detection of a burst
  29. GRB 100917A: TAROT La Silla observatory optical observations
  30. GRB 100915A: TAROT Calern observatory optical observations
  31. GRB100906A: Ashra-1 observation of early optical emission
  32. GRB 100917A: Swift-BAT refined analysis
  33. GRB 100917A: Swift detection of a burst
  34. GRB100915A: MITSuME Ishigakijima Optical upper limits
  35. GRB 100915B: GRT Optical Observation
  36. GRB 100915A: GRT Optical Observation
  37. GRB 100915B: Fermi GBM observation
  38. GRB 100915A: Swift/UVOT Upper Limits
  39. GRB 100915A: Swift-BAT refined analysis
  40. GRB 100915A: Swift-XRT refined analysis
  41. GRB 100915A: Enhanced Swift-XRT position
  42. GRB 100915B: a long GRB detected by INTEGRAL
  43. GRB 100915A: Swift detection of a likely burst
  44. GRB 100910A: Fermi GBM detection
  45. Swift-BAT trigger 433953 is not a burst
  46. Swift BAT Trigger 433953 probably not a GRB
  47. GRB100909A: MITSuME Ishigakijima Optical upper limits
  48. GRB 100909A: Swift/UVOT observations
  49. GRB 100901A: errata of GRB name in GCN 11270
  50. GRB 100901A: optical observations in Mondy and R-light curve
  51. GRB100909A: NOT optical afterglow confirmation
  52. GRB 100909A: Swift-XRT refined analysis
  53. GRB 100906A: optical observations at Mt.Terskol
  54. GRB 100901A: optical observation in Maidanak, break confirmation
  55. GRB 100909A: ROTSE-III Optical Limits
  56. GRB 100909A: Planned XMM-Newton observation
  57. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  58. GRB 100909A: Swift target of opportunity observation
  59. GRB 100909A: a long GRB detected by INTEGRAL
  60. GRB100901A: IAO optical upper limits at 4 days after the burst
  61. EVLA detection of radio afterglow of GRB100901A
  62. GRB 100901A: Confirmation of WSRT Radio Detection
  63. GRB 100901A: CrAO optical observations
  64. GRB 100906A: RTT150 optical observations
  65. GRB 100906A: GRAS-007 optical observations
  66. GRB100906A: R band observations
  67. Konus-Wind observation of GRB 100906A
  68. GRB100906A: non-detection at 15GHz
  69. GRB100906A: Optical observations at IAO
  70. GRB 100906A: Fermi GBM observation
  71. GRB 100906A: TLS Monitoring
  72. GRB 100901A: TLS Detection at 5.5 days
  73. GRB 100906A: Swift-XRT refined analysis
  74. GRB 100906A: Enhanced Swift-XRT position
  75. GRB 100906A: Swift/UVOT Observations
  76. GRB100906A: Errata of MITSuME Okayama about observation time
  77. GRB100906A: MITSuME Okayama Optical Observation
  78. GRB 100906A: Ondrejov 65cm observations
  79. GRB 100906A: TLS Multicolor Observations
  80. GRB 100905A: Swift/UVOT Upper Limits
  81. GRB 100901A: TLS observations, SDSS calibration, decay slope
  82. GRB 100901A: ISON-NM optical observations
  83. GRB 100906A: Swift-BAT refined analysis
  84. GRB 100906A: UKIRT zYJHK Observation
  85. GRB 100906A: MASTER preliminary polarization prompt light curve
  86. GRB 100906A: Gemini-N/GMOS redshift
  87. GRB 100906A : Faulkes Telescope North optical observations
  88. GRB 100906A: MASTER early OT observations
  89. GRB 100906A: Swift detection of a burst with an optical afterglow
  90. GRB 100829A: MASTER optical observations
  91. GRB100905A: Optical upper limits at IAO
  92. GRB100905A: MITSuME Okayama optical upper limits
  93. GRB 100905A: Swift-XRT refined analysis.
  94. GRB 100905A: UKIRT zJHK Observation
  95. GRB 100901A: Possible WSRT Radio Detection
  96. GRB 100905A: Enhanced Swift-XRT position
  97. GRB 100905A: Swift-BAT refined analysis
  98. GRB100904A: BOOTES-3 Upper Limit
  99. GRB 100905A: MASTER Prompt Optical Observations
  100. GRB 100905A: Faulkes Telescope North observations

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