Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

36069 results found.

  1. GRB 101008A: 1.23m CAHA optical observations
  2. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  3. GRB 101008A: Swift detection of a burst
  4. GRB 100728B: X-shooter redshift
  5. Refined analysis shows Swift Trigger 435520 is not a GRB
  6. Swift Trigger 435520 is probably not a GRB
  7. GRB 100925A / MAXI J1659-152: MASTER optical observations
  8. GRB 100924A: Suzaku WAM observation of the prompt emission
  9. GRB 100928A, Swift-BAT refined analysis
  10. GRB 100924A: Fermi GBM observation
  11. GRB 100928A: Swift detection of a burst
  12. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  13. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  14. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  15. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  16. GRB 100925A / MAXI J1659-152: SARA-S Observations
  17. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  18. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  19. GRB 100925A/MAXI J1659-152 - NOT optical observations
  20. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  21. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  22. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  23. GRB 100924A: GROND detection of an optical/NIR afterglow
  24. GRB 100925A: Swift detection of a burst
  25. GRB 100924A: Swift-BAT refined analysis
  26. GRB 100924A: Swift detection of a burst
  27. GRB 100917A: TAROT La Silla observatory optical observations
  28. GRB 100915A: TAROT Calern observatory optical observations
  29. GRB100906A: Ashra-1 observation of early optical emission
  30. GRB 100916A: Fermi GBM detection
  31. GRB 100917A: Swift-BAT refined analysis
  32. GRB 100917A: Swift detection of a burst
  33. GRB100915A: MITSuME Ishigakijima Optical upper limits
  34. GRB 100915B: GRT Optical Observation
  35. GRB 100915A: GRT Optical Observation
  36. GRB 100915B: Fermi GBM observation
  37. GRB 100915A: Correction to Swift-BAT refined analysis
  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. GRB 100909A: Swift-XRT refined analysis
  52. GRB 100906A: optical observations at Mt.Terskol
  53. GRB 100901A: optical observation in Maidanak, break confirmation
  54. GRB 100909A: Faulkes Telescope North afterglow candidate
  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. GRB100906A: detection at 15GHz
  61. GRB100901A: IAO optical upper limits at 4 days after the burst
  62. EVLA detection of radio afterglow of GRB100901A
  63. GRB 100901A: Confirmation of WSRT Radio Detection
  64. GRB 100901A: CrAO optical observations
  65. GRB 100906A: RTT150 optical observations
  66. GRB 100906A: GRAS-007 optical observations
  67. GRB100906A: R band observations
  68. Konus-Wind observation of GRB 100906A
  69. GRB100906A: non-detection at 15GHz
  70. GRB100906A: Optical observations at IAO
  71. GRB 100906A: Fermi GBM observation
  72. GRB 100906A: TLS Monitoring
  73. GRB 100901A: TLS Detection at 5.5 days
  74. GRB 100906A: Observations at the Virtual Telescope
  75. GRB 100906A: Swift-XRT refined analysis
  76. GRB 100906A: Enhanced Swift-XRT position
  77. GRB 100906A: Swift/UVOT Observations
  78. GRB100906A: MITSuME Okayama Optical Observation
  79. GRB 100906A: Ondrejov 65cm observations
  80. GRB 100906A: TLS Multicolor Observations
  81. GRB 100905A: Swift/UVOT Upper Limits
  82. GRB 100901A: TLS observations, SDSS calibration, decay slope
  83. GRB 100906A: MASTER preliminary prompt+afterglow lc
  84. GRB 100901A: ISON-NM optical observations
  85. GRB 100906A: Swift-BAT refined analysis
  86. GRB 100906A: UKIRT zYJHK Observation
  87. GRB 100906A: MASTER preliminary polarization prompt light curve
  88. GRB 100906A: Gemini-N/GMOS redshift
  89. GRB 100906A : Faulkes Telescope North optical observations
  90. GRB 100906A: MASTER early OT observations
  91. GRB 100906A: Swift detection of a burst with an optical afterglow
  92. GRB 100829A: MASTER optical observations
  93. GRB100905A: Optical upper limits at IAO
  94. GRB100905A: MITSuME Okayama optical upper limits
  95. GRB 100905A: Swift-XRT refined analysis.
  96. GRB 100905A: UKIRT zJHK Observation
  97. GRB 100901A: Possible WSRT Radio Detection
  98. GRB 100905A: Enhanced Swift-XRT position
  99. GRB 100905A: Swift-BAT refined analysis
  100. GRB100904A: BOOTES-3 Upper Limit

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov