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"

21089 results found.

  1. GRB 090912: Swift/UVOT Upper Limits
  2. GRB 090912 optical upper limit
  3. GRB 090814A: Skynet/DSO & GORT Observations
  4. GRB 090904B: GROND detection of the optical afterglow
  5. GRB 090904A: Swift/UVOT Refined Analysis
  6. GRB 090904B: Swift/UVOT Refined Analysis
  7. GRB 090902B: VLA radio detection
  8. GRB 090904A: NOT observations
  9. GRB 090902B: WSRT Radio Observation
  10. GRB090904B: REM observations
  11. GRB 090904: Swift detection of a burst
  12. GRB 090902B: Swift/UVOT refined analysis
  13. GRB 090902B: Faulkes Telescope North observations
  14. GRB 090902B: GROND NIR Afterglow Observations
  15. GRB 090902B: Optical afterglow candidate
  16. GRB090902B: Swift/UVOT observations
  17. GRB 090902B: Swift/XRT Afterglow Candidate
  18. GRB 090831C: GROND upper limits
  19. Konus-Wind observations of GRB 090831A
  20. GRB090831C: Swift/UVOT upper limits
  21. Konus-Wind observations of GRB 090827
  22. GRB 090827: Swift XRT and UVOT observations
  23. GRB 090817 - TLS Observations
  24. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  25. GRB 090817: No host galaxy, no supernova
  26. Konus-Wind observations of GRB 090823
  27. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  28. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  29. GRB 090820: MASTER-Net optical polarization observations
  30. GRB 090820: Fermi GBM Detection of a bright burst.
  31. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  32. GRB 090817: Liverpool Telescope Observations
  33. GRB 090817: optical upper limit
  34. GRB 090817: Swift/UVOT Upper Limits
  35. GRB 090813: I-band observations from 1.5m OSN telescope
  36. GRB 090817: Swift-XRT observations
  37. GRB 090814A: optical observations
  38. VLA radio non-detection of GRB 090812
  39. GRB 090813: CrAO optical obsevations
  40. GRB 090814B: I-band observations from 1.23m CAHA telescope
  41. GRB 090814B: Liverpool Telescope Observations
  42. GRB 090814A: Swift/UVOT Observations
  43. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  44. Konus-Wind observations of GRB090813
  45. GRB090813: Swift/UVOT upper limits
  46. GRB 090813: Liverpool Telescope afterglow confirmation
  47. GRB 090813: P60 Optical Afterglow Confirmation
  48. GRB 090813: optical candidate from 1.23m CAHA telescope
  49. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  50. GRB 090812: RAPTOR detections during the burst
  51. GRB090812: Swift/UVOT observations
  52. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  53. GRB 090812: P60 Confirmation of Optical Afterglow
  54. GRB 090809: Further NOT optical observations
  55. GRB 090621B: MAGIC telescope GeV observation
  56. GRB 090621A: MAGIC telescope GeV observation
  57. GRB 090809: WHT observations
  58. GRB090809: Swift/UVOT observations
  59. GRB 090809: afterglow confirmation at the NOT
  60. GRB 090807: Liverpool Telescope observations
  61. GRB 090807: Swift/UVOT Upper Limits
  62. GRB 090709A : Quick look analysis of the Suzaku observation
  63. GRB 090727: optical observations
  64. GRB 090727: Swift/UVOT Upper Limits
  65. GRB 090728: Swift/UVOT Upper Limits
  66. GRB 090727: I-band observations from 1.23m CAHA
  67. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  68. GRB 090715B: Late-time Lick 3m observations
  69. GRB090726: Swift/UVOT observations
  70. GRB 090726: D50 optical observations
  71. Konus-Wind and Konus-RF observations of GRB 090719
  72. Konus-RF and Konus-Wind observations of GRB 090718B
  73. Konus-Wind observations of bright hard GRB 090720B
  74. GRB 090720: Gemini-North Imaging and Optical Afterglow
  75. Swift XRT and UVOT refned analysis of GRB 090720
  76. GRB 090709A: Swift XRT Timing Analysis
  77. GRB 090715B: further NOT optical observations
  78. GRB 090709A - CARMA mm Observations
  79. GRB 090715B: Lick observations
  80. GRB 090715A: VLA observations
  81. Konus-Wind observations of short/hard GRB 090715A
  82. Konus-Wind and Konus-RF observations of GRB 090715B
  83. GRB 090715B: Swift/UVOT followup observations
  84. GRB 090715B: break in the optical afterglow decay
  85. GRB 090715B: Observation of the optical afterglow
  86. GRB 090715B: NOT optical observations
  87. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  88. GRB 090709A: Xinglong TNT optical upper limit
  89. VLA radio observations of GRB 090709A
  90. GRB 090621B: MTM-500 optical observations
  91. GRB 090709A: deep optical observation with the 10.4m GTC
  92. GRB090709A : WSRT Radio observation
  93. GRB 090709A: WHT LIRIS observations
  94. Konus-Wind and Konus-RF observations of GRB 090709A
  95. GRB 090709A: P60 Observations
  96. GRB 090709A: NOT optical observations
  97. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  98. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  99. GRB 090709A: Subaru NIR observation
  100. GRB 090709: PAIRITEL NIR 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