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"

19684 results found.

  1. GRB 160203A: Zadko observatory - Gingin optical detection
  2. GRB 160206A: GROND Observations
  3. GRB 160206A: Tiled Swift observations
  4. GRB 160203A: TSHAO optical observations
  5. GRB 160203A: RATIR Optical Observations
  6. GRB 160131A: RATIR Optical Observations
  7. GRB 160203A: Skynet PROMPT-CTIO observations of the optical afterglow
  8. GRB 160203A: Swift/UVOT Detection
  9. GRB 160203A: Enhanced Swift-XRT position
  10. GRB 160203A: LCOGT-Cerro Tololo optical afterglow confirmation
  11. GRB 160203A: GROND Afterglow Candidate
  12. GRB 160203A: Swift detection of a burst
  13. GRB 160131A: AbAO optical observations
  14. GRB 160131A Swift/UVOT Detection
  15. GRB 160131A: MITSuME Ishigakijima Optical Observation
  16. GRB 160131A: GROND Detection of the Optical/NIR Afterglow
  17. GRB 160131A: Bassano Bresciano Observatory optical observations
  18. GRB 160131A: Swift-XRT refined Analysis
  19. GRB 160131A: Khureltogot optical observations
  20. GRB 160131A: TNG optical observations
  21. GRB 160131A: Enhanced Swift-XRT position
  22. GRB 160131A: LCOGT-SSO optical observations
  23. GRB 160131A: RATIR Optical Observations
  24. GRB 160131A: Swift detection of a burst with an optical counterpart
  25. GRB 160127A: RATIR Optical Observations
  26. GRB 160127A: Khureltogot optical observations
  27. GRB 160127A: LCOGT-Sutherland optical upper limit
  28. GRB 160127A: Swift/UVOT Detection
  29. GRB 160123A: TAROT La Silla observatory optical observations
  30. GRB 160127A: RATIR Optical Observations
  31. GRB 160127A: Enhanced Swift-XRT position
  32. GRB 160127A: TAROT La Silla observatory optical light curve
  33. GRB 160127A: Swift detection of a burst with an optical counterpart
  34. GRB 160123A: GROND Upper limits
  35. GRB 160121A: RATIR Optical Observations
  36. GRB 160121A: TSHAO optical observation
  37. GRB 160123A: NOT J-band observations
  38. GRB 160123A: Swift/UVOT Upper Limits
  39. GRB 160123A: LCOGT-SSO optical upper limit
  40. GRB 160123A: Enhanced Swift-XRT position
  41. GRB 160123A: Swift detection of a burst
  42. GRB 160121A: redshift from the 10.4m GTC
  43. GRB 160121A: RATIR Optical Observations
  44. GRB 160121A: Swift/UVOT Upper Limits
  45. GRB 160121A: GROND Afterglow observations
  46. GRB 160121A: TSHAO optical afterglow confirmation
  47. GRB 160121A: Enhanced Swift-XRT position
  48. GRB 160121A: 1.8m MOA optical afterglow detection
  49. GRB 160117B: RATIR continued observations
  50. GRB 160121A: Swift detection of a burst
  51. GRB 160117A: Swift-XRT afterglow detection
  52. GRB 160117B: further RATIR observations
  53. GRB 160119A: afterglow confirmation from the NOT
  54. GRB160119A: BOOTES-2/TELMA Early Upper Limits
  55. GRB 160119A: Swift/UVOT Upper Limits
  56. LIGO/Virgo G184098: MASTER final result
  57. GRB 160119A: GROND optical/NIR afterglow observations
  58. GRB 160119A: RATIR Optical and NIR Observations
  59. GRB 160117B: RATIR Optical and NIR Observations
  60. GRB 160119A: Enhanced Swift-XRT position
  61. GRB 160119A: NOT and GTC afterglow candidate
  62. GRB 160117B: Early iTelescope observation
  63. GRB 160119A: Swift detection of a burst
  64. GRB 160117A: Swift/UVOT Upper Limits
  65. GRB 151228B: AbAO optical upper limit
  66. GRB 160104A: ISON-Ussuriysk optical observations
  67. GRB 160117B: GROND optical/NIR afterglow observations
  68. GRB 160117B: Swift/UVOT Detection
  69. GRB 160117B: Enhanced Swift-XRT position
  70. GRB 160117B: LCOGT-SSO optical observations
  71. Konus-Wind observation of GRB 160113A
  72. GRB 160117B: Swift detection of a burst with optical counterpart
  73. GRB 160106A: CALET Gamma-Ray Burst Monitor detection
  74. IPN Triangulation of GRB 160113A
  75. LIGO/Virgo G211117: Further Swift-XRT sources
  76. IPN Triangulation of GRB 160111A (short/hard)
  77. GRB 160113A: Swift ToO observations
  78. GRB 160104A: Swift/UVOT Detection
  79. IPN Triangulation of GRB 151231A
  80. IPN Triangulation of GRB 151229B (extremely intense/long)
  81. LIGO/Virgo G211117: iPTF Observations of PS15dpn
  82. LIGO/Virgo G211117: Pi of the Sky observations
  83. LIGO/Virgo G211117: VISTA imaging
  84. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  85. IPN Triangulation of GRB 151225A (short/hard)
  86. GRB 160104A: Nishi-Harima MINT Observations
  87. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  88. GRB 160104A: GWAC upper limit during prompt emission phase
  89. GRB 160104A: MITSuME Okayama upper limits
  90. LIGO/Virgo G211117: INAF TNG follow-up of Kanata telescope candidate
  91. GRB 160104A: Enhanced Swift-XRT position
  92. GRB 160104A: MITSuME Okayama Ks-band upper-limit
  93. GRB 160104A: Swift detection of a burst
  94. GRB 160101A: CALET Gamma-Ray Burst Monitor detection
  95. LIGO/Virgo G211117: Gemini classification of 7 Pan-STARRS transients
  96. LIGO/Virgo G211117: LOFAR follow-up
  97. GRB 160102A: Swift-XRT observations
  98. GRB 160101A: MITSuME Akeno optical upper limits
  99. LIGO/Virgo G211117: CSS/CRTS observations on 29/30 Dec 2015 UT
  100. GRB 160102A: Tiled Swift observations

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