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"

20994 results found.

  1. GRB 091102: Swift/UVOT Upper Limits
  2. GRB 091102: GROND Upper Limits
  3. GRB 091102: BOOTES-3 observations
  4. GRB 091102: Swift/XRT localization
  5. GRB 091024: optical observations
  6. GRB 090926a, SMARTS optical/IR afterglow observations
  7. GRB 091018: Skynet/PROMPT Observations of Possible Host Galaxy
  8. GRB 091029, SMARTS optical/IR afterglow observations
  9. GRB 091018, SMARTS optical/IR afterglow observations
  10. GRB091029: Swift/UVOT observations
  11. GRB 091029: Skynet/PROMPT Continued Observations of Fading
  12. GRB 091029: BOOTES-3 observations
  13. GRB091024 optical observations
  14. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  15. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  16. GRB 091024: Keck/LRIS Spectroscopy
  17. GRB 091024: YNAO-GMG observations
  18. GRB 091026: GROND Upper Limits
  19. GRB 091020: Late TLS detection
  20. Radio afterglow detection from GRB 091020
  21. GRB 091026: Swift/UVOT Upper Limits
  22. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  23. Konus-Wind and Konus-RF observations of GRB 091024
  24. GRB 091020 : Xinglong TNT upper limit
  25. GRB 091024: TLS Upper Limit
  26. GRB 091024: KAIT optical afterglow observations
  27. GRB 091024: Super-LOTIS early observations
  28. GRB091024: VRcIc Afterglow Observations
  29. GRB 091024: Fermi GBM Observations
  30. GRB 091024: Xinglong TNT optical observation
  31. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  32. GRB 091024 Gemini-North redshift
  33. GRB 091024: GRAS004 optical observations
  34. GRB 091024: Faulkes Telescope North Afterglow Candidate
  35. GRB 091018: Skynet/PROMPT Continued Observations of Fading
  36. GRB 091020: Additional Lick observations
  37. Konus-Wind observations of GRB 091020 (correction to GCN 10057)
  38. GRB 091020: Lick observations
  39. Konus-Wind observations of GRB 091010
  40. GRB091020 Swift/UVOT observations
  41. GRB 091020: MASTER optical transient polarimetry
  42. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  43. GRB 091018: miniTAO/ANIR Observations
  44. GRB 091018: Skynet/PROMPT Observations of Fading
  45. GRB 091018 : Faulkes Telescope South Observations
  46. GRB 091018: BOOTES-3 observations
  47. GRB091018: Swift/UVOT observations
  48. GRB 091018: GROND observations
  49. GRB091018: Magellan Echellette Observations
  50. GRB 091018: ROTSE-III Detection of Optical Counterpart
  51. GRB 091015: Skynet/PROMPT Observations
  52. GRB 091003: Possible Supernova Component
  53. GRB 091003: Gemini-N redshift of possible host galaxy
  54. GRB 091015: RTT150 optical observations
  55. GRB 090726 R band observations
  56. GRB 090815: a faint long GRB localized by INTEGRAL
  57. GRB 091010: Swift-XRT refined analysis
  58. Radio observation of GRB090927 with ATCA
  59. Radio observation of GRB090926a with ATCA
  60. GRB 091010: Faulkes Telescope North observations
  61. GRB 090531A: Skynet/PROMPT Observations
  62. GRB 091010: RXTE detection
  63. Konus-Wind observations of GRB 091010
  64. GRB 091010 optical upper limits
  65. GRB 091010: Swift/UVOT Upper Limits
  66. GRB 090926A: Skynet/PROMPT Observations of Day 6 - 11 Fading
  67. GRB 090518: Skynet/PROMPT Observations
  68. Short-Duration GRB 090621: Skynet/Dolomiti Observations
  69. GRB 090904A: afterglow confirmation
  70. GRB 090812: Skynet/PROMPT and GORT Observations
  71. GRB 091003: Lick observations and possible SDSS host galaxy
  72. GRB 090926B: Skynet/PROMPT Observations
  73. GRB 091003: WHT ACAM observations
  74. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  75. GRB 091003: Skynet/DSO Observations
  76. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  77. GRB 091003A: Fermi LAT detection
  78. GRB 090926A: Skynet/PROMPT Observations of Day 4 - 6 Fading Rate
  79. GRB 090926A: Skynet/PROMPT Observations of Post-Peak Fading
  80. GRB 090929A: Swift/UVOT Observations
  81. GRB 090929B: Gemini-N upper limits
  82. GRB 090929B: Skynet/DSO Observations
  83. GRB 090929B: Swift/UVOT Observations
  84. GRB 090929B: Swift detection of a burst
  85. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  86. Konus-Wind and Konus-RF observations of GRB 090926A
  87. GRB 090927: VLT redshift
  88. GRB 090927: Zadko Telescope observations
  89. Swift/UVOT observations of GRB 090927
  90. GRB 090926A: Skynet/PROMPT Continued Observations
  91. GRB090926B: Swift/UVOT Upper Limits
  92. GRB090926A: Swift/UVOT observations
  93. GRB 090926B: VLT spectroscopy
  94. GRB 090926B: optical object in error circle
  95. GRB 090926A: VLT/X-shooter redshift
  96. GRB 090926B: NOT optical observation
  97. GRB 090926A: Swift/UVOT detection of an optical afterglow
  98. GRB 090726: Skynet/GORT Observations
  99. GRB 090807: Skynet/DSO Observations
  100. GRB 090915: GROND upper limits

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