Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

36328 results found.

  1. GGRB 101023A: GROND detection of the optical-NIR afterglow
  2. GRB 101023A: Swift-XRT Team Refined Analysis
  3. GRB 101023A: Swift-BAT refined analysis
  4. GRB 101023A: Gemini discovery of optical afterglow
  5. GRB 101023A: Enhanced Swift-XRT position
  6. GRB 101023A: REM NIR observations
  7. GRB 101023A: Swift detection of a burst
  8. GRB 101011A: miniTAO/ANIR NIR upper limits
  9. GRB 101020A: MASTER prompt and afterglow limit
  10. GRB 101020A: BOOTES2 follow-up and limit
  11. GRB 101020A: MASTER polarization optical observations
  12. GRB 101020A, Swift-BAT refined analysis
  13. GRB 101020A: Swift detection of a burst
  14. GRB 101017A: miniTAO/ANIR NIR upper limits
  15. GRB 101017A: Swift XRT refined analysis
  16. GRB 101017A: Swift/UVOT Observations
  17. GRB 101008A: correction to the GCN 11352
  18. GRB 101008A: optical observations
  19. GRB101017A: MITSuME Okayama optical upper limits
  20. Konus-Wind observation of GRB 101017A
  21. GRB 101014A: Fermi LAT detection
  22. GRB 101017A: Enhanced Swift-XRT position
  23. GRB 101017A: Swift-BAT refined analysis
  24. GRB 101017A: ROTSE-III Optical Limits
  25. GRB 101017A: Swift detection of a burst with optical counterpart
  26. GRB 101011A: Fermi GBM detection
  27. GRB 101011A: BOOTES-3 Upper Limit
  28. Konus-Wind observation of GRB 101014A
  29. GRB 101014A: Fermi GBM detection
  30. GRB 100906A: D50 optical detection
  31. GRB 100902A: D50 optical limit
  32. GRB 101011A: Swift/UVOT observations
  33. GRB 101011A, GROND upper limits
  34. GRB 101011A: Zadko observatory - Gingin optical observations
  35. GRB 101011A: XRT Refined Analysis
  36. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  37. GRB 101011A: Enhanced Swift-XRT position
  38. GRB 101011A: Swift-BAT refined analysis
  39. GRB 101011A: Swift detection of a burst
  40. GRB 101008A: Fermi GBM observation
  41. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  42. GRB 101008A: MASTER prompt optical observations
  43. GRB 101008A: Swift-BAT refined analysis
  44. GRB101008A, GROND detection of a fading afterglow
  45. GRB 101008A: Swift-XRT refined analysis
  46. GRB 101008A: SAO RAS optical observations
  47. GRB 100915 optical upper limit
  48. GRB 101008: Swift/UVOT Upper Limits
  49. GRB 101008A: Enhanced Swift-XRT position
  50. GRB 101008A: 1.23m CAHA optical observations
  51. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  52. GRB 101008A: Swift detection of a burst
  53. GRB 100728B: X-shooter redshift
  54. Refined analysis shows Swift Trigger 435520 is not a GRB
  55. Swift Trigger 435520 is probably not a GRB
  56. GRB 100925A / MAXI J1659-152: MASTER optical observations
  57. GRB 100924A: Suzaku WAM observation of the prompt emission
  58. GRB 100928A, Swift-BAT refined analysis
  59. GRB 100924A: Fermi GBM observation
  60. GRB 100928A: Swift detection of a burst
  61. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  62. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  63. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  64. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  65. GRB 100925A / MAXI J1659-152: SARA-S Observations
  66. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  67. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  68. GRB 100925A/MAXI J1659-152 - NOT optical observations
  69. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  70. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  71. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  72. GRB 100924A: GROND detection of an optical/NIR afterglow
  73. GRB 100925A: Swift detection of a burst
  74. GRB 100924A: Swift-BAT refined analysis
  75. GRB 100924A: Swift detection of a burst
  76. GRB 100917A: TAROT La Silla observatory optical observations
  77. GRB 100915A: TAROT Calern observatory optical observations
  78. GRB100906A: Ashra-1 observation of early optical emission
  79. GRB 100916A: Fermi GBM detection
  80. GRB 100917A: Swift-BAT refined analysis
  81. GRB 100917A: Swift detection of a burst
  82. GRB100915A: MITSuME Ishigakijima Optical upper limits
  83. GRB 100915B: GRT Optical Observation
  84. GRB 100915A: GRT Optical Observation
  85. GRB 100915B: Fermi GBM observation
  86. GRB 100915A: Correction to Swift-BAT refined analysis
  87. GRB 100915A: Swift/UVOT Upper Limits
  88. GRB 100915A: Swift-BAT refined analysis
  89. GRB 100915A: Swift-XRT refined analysis
  90. GRB 100915A: Enhanced Swift-XRT position
  91. GRB 100915B: a long GRB detected by INTEGRAL
  92. GRB 100915A: Swift detection of a likely burst
  93. GRB 100910A: Fermi GBM detection
  94. Swift-BAT trigger 433953 is not a burst
  95. Swift BAT Trigger 433953 probably not a GRB
  96. GRB100909A: MITSuME Ishigakijima Optical upper limits
  97. GRB 100909A: Swift/UVOT observations
  98. GRB 100901A: errata of GRB name in GCN 11270
  99. GRB 100901A: optical observations in Mondy and R-light curve
  100. GRB 100909A: Swift-XRT refined analysis

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