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"

21044 results found.

  1. GRB 091015: Skynet/PROMPT Observations
  2. GRB 091003: Possible Supernova Component
  3. GRB 091003: Gemini-N redshift of possible host galaxy
  4. GRB 091015: RTT150 optical observations
  5. GRB 090726 R band observations
  6. GRB 090815: a faint long GRB localized by INTEGRAL
  7. GRB 091010: Swift-XRT refined analysis
  8. Radio observation of GRB090927 with ATCA
  9. Radio observation of GRB090926a with ATCA
  10. GRB 091010: Faulkes Telescope North observations
  11. GRB 090531A: Skynet/PROMPT Observations
  12. GRB 091010: RXTE detection
  13. Konus-Wind observations of GRB 091010
  14. GRB 091010 optical upper limits
  15. GRB 091010: Swift/UVOT Upper Limits
  16. GRB 090926A: Skynet/PROMPT Observations of Day 6 - 11 Fading
  17. GRB 090518: Skynet/PROMPT Observations
  18. Short-Duration GRB 090621: Skynet/Dolomiti Observations
  19. GRB 090904A: afterglow confirmation
  20. GRB 090812: Skynet/PROMPT and GORT Observations
  21. GRB 091003: Lick observations and possible SDSS host galaxy
  22. GRB 090926B: Skynet/PROMPT Observations
  23. GRB 091003: WHT ACAM observations
  24. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  25. GRB 091003: Skynet/DSO Observations
  26. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  27. GRB 091003A: Fermi LAT detection
  28. GRB 090926A: Skynet/PROMPT Observations of Day 4 - 6 Fading Rate
  29. GRB 090926A: Skynet/PROMPT Observations of Post-Peak Fading
  30. GRB 090929A: Swift/UVOT Observations
  31. GRB 090929B: Gemini-N upper limits
  32. GRB 090929B: Skynet/DSO Observations
  33. GRB 090929B: Swift/UVOT Observations
  34. GRB 090929B: Swift detection of a burst
  35. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  36. Konus-Wind and Konus-RF observations of GRB 090926A
  37. GRB 090927: VLT redshift
  38. GRB 090927: Zadko Telescope observations
  39. Swift/UVOT observations of GRB 090927
  40. GRB 090926A: Skynet/PROMPT Continued Observations
  41. GRB090926B: Swift/UVOT Upper Limits
  42. GRB090926A: Swift/UVOT observations
  43. GRB 090926B: VLT spectroscopy
  44. GRB 090926B: optical object in error circle
  45. GRB 090926A: VLT/X-shooter redshift
  46. GRB 090926B: NOT optical observation
  47. GRB 090926A: Swift/UVOT detection of an optical afterglow
  48. GRB 090726: Skynet/GORT Observations
  49. GRB 090807: Skynet/DSO Observations
  50. GRB 090915: GROND upper limits
  51. Short-Duration GRB 090916: Skynet/PROMPT Observations
  52. GRB 090915: SARA detection of afterglow candidate
  53. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  54. GRB 090702: Skynet/GORT Observations
  55. GRB 090902B: Skynet/PROMPT Observations
  56. GRB 090912: Swift/UVOT Upper Limits
  57. GRB 090912 optical upper limit
  58. GRB 090814A: Skynet/DSO & GORT Observations
  59. GRB 090904B: GROND detection of the optical afterglow
  60. GRB 090904A: Swift/UVOT Refined Analysis
  61. GRB 090904B: Swift/UVOT Refined Analysis
  62. GRB 090902B: VLA radio detection
  63. GRB 090904A: NOT observations
  64. GRB 090902B: WSRT Radio Observation
  65. GRB090904B: REM observations
  66. GRB 090904: Swift detection of a burst
  67. GRB 090902B: Swift/UVOT refined analysis
  68. GRB 090902B: Faulkes Telescope North observations
  69. GRB 090902B: GROND NIR Afterglow Observations
  70. GRB 090902B: Optical afterglow candidate
  71. GRB090902B: Swift/UVOT observations
  72. GRB 090902B: Swift/XRT Afterglow Candidate
  73. GRB 090831C: GROND upper limits
  74. Konus-Wind observations of GRB 090831A
  75. GRB090831C: Swift/UVOT upper limits
  76. Konus-Wind observations of GRB 090827
  77. GRB 090827: Swift XRT and UVOT observations
  78. GRB 090817 - TLS Observations
  79. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  80. GRB 090817: No host galaxy, no supernova
  81. Konus-Wind observations of GRB 090823
  82. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  83. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  84. GRB 090820: MASTER-Net optical polarization observations
  85. GRB 090820: Fermi GBM Detection of a bright burst.
  86. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  87. GRB 090817: Liverpool Telescope Observations
  88. GRB 090817: optical upper limit
  89. GRB 090817: Swift/UVOT Upper Limits
  90. GRB 090813: I-band observations from 1.5m OSN telescope
  91. GRB 090817: Swift-XRT observations
  92. GRB 090814A: optical observations
  93. VLA radio non-detection of GRB 090812
  94. GRB 090813: CrAO optical obsevations
  95. GRB 090814B: I-band observations from 1.23m CAHA telescope
  96. GRB 090814B: Liverpool Telescope Observations
  97. GRB 090814A: Swift/UVOT Observations
  98. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  99. Konus-Wind observations of GRB090813
  100. GRB090813: Swift/UVOT 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