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"

6828 results found.

  1. GRB 091117: Swift-XRT observations
  2. GRB 091117: Evidence for Variability of XRT Source #1
  3. GRB 091117: Swift XRT refined analysis
  4. GRB091111: Swift XRT refined analysis
  5. GRB 091031: Fermi LAT detection of a faint burst
  6. GRB 091109B: Swift-XRT Team refined analysis
  7. GRB 091109: Swift-XRT refined analysis
  8. GRB 091104: Swift XRT Refined Analysis
  9. GRB091026 : IRSF NIR upper limit
  10. Fermi LAT Upper Limits on GRB 091010
  11. GRB 091102: Swift-XRT refined analysis
  12. GRB 091024: Fermi LAT upper limits
  13. GRB 091029: Swift XRT refined analysis
  14. GRB091024 optical observations
  15. GRB 091026: Swift/UVOT Upper Limits
  16. GRB 091026: Swift-XRT refined analysis
  17. GRB 091020: Early TLS Multicolor detections, red afterglow
  18. GRB091024: VRcIc Afterglow Observations
  19. GRB 091024: Fermi GBM Observations
  20. GRB 091024: Swift-XRT team refined analysis
  21. GRB 091020: Swift-XRT refined analysis
  22. GRB 091018: Swift XRT refined analysis
  23. GRB 091018: miniTAO/ANIR Observations
  24. GRB 090726 R band observations
  25. GRB 091010: Swift-XRT refined analysis
  26. GRB 091010: Swift-XRT position
  27. GRB 091003: Swift-XRT confirmation of fading afterglow
  28. GRB 091003: Swift XRT analysis
  29. GRB 091003A: Fermi LAT detection
  30. GRB 090929A: Swift-XRT non-detection
  31. GRB 090929B: Swift-XRT refined analysis
  32. GRB 090926A: Fermi LAT and GBM refined analysis
  33. GRB090926A: Swift-XRT refined analysis
  34. GRB 090926: Fermi LAT detection
  35. GRB090904B : IRSF NIR upper limit
  36. GRB 090916: Swift-XRT upper limit
  37. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  38. GRB 090827: Confirmation of the X-ray afterglow
  39. GRB 090912: Swift-XRT refined analysis
  40. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  41. GRB 090904A: Swift-XRT refined analysis
  42. GRB 090904B: Swift XRT Refined Analysis
  43. GRB 090904A: Enhanced Swift XRT position
  44. GRB090902B: Swift XRT refined analysis
  45. GRB 090902B: Fermi LAT and GBM refined analysis.
  46. GRB 090902B: Enhanced Swift-XRT position
  47. GRB 090902B: Fermi LAT detection
  48. Swift Trigger 361477, called GRB090831B, is probably not real.
  49. GRB 090831C: Swift XRT Refined Analysis
  50. GRB 090827: Swift XRT and UVOT observations
  51. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  52. GRB 090817: No host galaxy, no supernova
  53. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  54. GRB 090817: Confirmation of the X-ray afterglow
  55. GRB 090815C: Swift refined analysis
  56. GRB 090817: Swift-XRT observations
  57. GRB 090814B: Confirmation of the X-ray afterglow
  58. GRB 090814B: I-band observations from 1.23m CAHA telescope
  59. GRB 090814B: Swift/UVOT Upper Limits
  60. GRB 090814B: Swift-XRT detection of a possible afterglow.
  61. GRB 090814A: Swift-XRT Team Refined Analysis
  62. GRB 090813: Swift-XRT refined analysis
  63. GRB090813: Swift/UVOT upper limits
  64. GRB 090812: Swift XRT refined analysis
  65. GRB 090621B: MAGIC telescope GeV observation
  66. GRB 090621A: MAGIC telescope GeV observation
  67. GRB 090809: WHT observations
  68. GRB 090809: Swift-XRT refined analysis
  69. GRB 090807: Swift-XRT refined analysis
  70. GRB 090728: Swift XRT refined analysis
  71. GRB 090727: Swift-XRT refined analysis
  72. GRB 090715B: Late-time Lick 3m observations
  73. GRB 090726: Swift-XRT Team refined analysis
  74. GRB 090726: optical transient candidate
  75. GRB 090715B: Lick observations
  76. GRB 090715B: break in the optical afterglow decay
  77. GRB 090715B: Swift XRT Refined Analysis
  78. GRB 090709A: deep optical observation with the 10.4m GTC
  79. GRB 090709A: Swift XRT Refined Analysis
  80. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  81. GRB 090709: PAIRITEL NIR Upper Limits
  82. Possible GRB090705: Swift-XRT observations
  83. GRB 090705: PAIRITEL NIR Observations
  84. XRF 090702: Swift-XRT refined analysis
  85. GRB 090628: Swift XRT refined analysis
  86. Fermi LAT observations of GRB 090626
  87. GRB 090625B: Swift-XRT refined analysis
  88. PAIRITEL observations of GRB 090618
  89. GRB 090621B: Swift-XRT refined analysis
  90. GRB 090621: Swift-XRT Team refined analysis
  91. GRB090618: Swift-XRT team refined analysis
  92. Swift XRT observations of GRB 090531A
  93. RXTE Discovery of Pulsations from SGR 0418+5729
  94. GRB 090607: XRT Team Refined Analysis
  95. GRB090530: Swift XRT refined analysis
  96. GRB 090529: Swift-XRT refined analysis
  97. GRB 090530: PAIRITEL NIR Detections
  98. GRB 090529: TLS Afterglow Observations
  99. GRB 090423: Fermi GBM T90 follow-up analysis results
  100. GRB 090516: Fermi GBM observation

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