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"

28227 results found.

  1. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  2. GRB 070809: The Swift evidence for the SHB nature of this burst
  3. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  4. GRB 070913: Swift-BAT refined analysis
  5. GRB 070913: SMARTS optical/IR observations
  6. GRB 070913: TAROT La Silla observatory optical observations
  7. GRB 070911: PAIRITEL IR Observations
  8. GRB 070911: Swift XRT refined analysis
  9. GRB 070911, Swift-BAT refined analysis
  10. Intense burst from SGR 1806-20 detected on September 7
  11. GRB 070809: Confirmation of optical transient
  12. Candidate Orphan GRB Optical Transient in IC 4779
  13. Las Campanas observations of possible TAROT GRB transient near IC
  14. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  15. GRB 070824 - Combined SuperAGILE/IPN Localization
  16. GRB 070731: Swift/UVOT Upper Limit
  17. GRB 070805: UVOT afterglow candidate retraction
  18. GRB 070810B : Faulkes Telescope South Observations
  19. GRB 070810A: Continued Keck Imaging
  20. GRB 070810B: Keck spectroscopy of possible host galaxies
  21. GRB070810B: Swift/UVOT Upper Limits
  22. GRB 070810B: XRT refined analysis
  23. GRB 070810B, Swift-BAT refined analysis
  24. Swift Trigger 287421: False trigger due to star tracker loss
  25. GRB 070810A: Swift-BAT refined analysis
  26. GRB 070810B: Xinglong TNT optical Upper Limit
  27. GRB070810B: Optical observations with KANATA
  28. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  29. GRB 070809: Swift/UVOT Upper Limits
  30. VLA upper limit on the short hard burst GRB 070729
  31. No radio detection in superAGILE burst 070724B
  32. GRB 070809: Keck Imaging
  33. GRB 070810: Swift-XRT Team Refined Analysis
  34. GRB 070809: Swift-XRT refined analysis
  35. GRB 070810: enhanced Swift-XRT position
  36. GRB 070810: Swift/UVOT Optical Counterpart
  37. GRB 070809, Swift-BAT refined analysis
  38. GRB 070808: Swift/UVOT upper limits
  39. GRB 070809: Swift detection of a short burst
  40. GRB 070808 : Faulkes Telescope South Observations
  41. GCN Swift XRT update position notices and enhanced position circulars
  42. GRB 070808: Swift XRT refined analysis
  43. GRB 070808, Swift-BAT refined analysis
  44. GRB 070808: OPTIMA-Burst optical upper limit
  45. GRB 070808: Xinglong TNT optical Upper Limit
  46. GRB070808: Optical observations with KANATA
  47. GRB070808 - SDSS Pre-Burst Observations
  48. GRB 070808: ROTSE-III Optical Limits
  49. GRB070805 XRT and UVOT afterglow candidate
  50. GRB070612A: Radio upper limit from GMRT
  51. GRB 070721B: correct afterglow position
  52. Swift/UVOT observations of GRB070805
  53. GRB 070805, Swift-BAT refined analysis
  54. UVOT observations of SAXJ1810.8-2609
  55. Swift detection of a outburst from SAX J1810.8-2609
  56. VLA non-detection of GRB 070721B
  57. GRB 070802: REM optical observations
  58. GRB 070802: Swift-XRT refined analysis
  59. GRB070802: Swift/UVOT upper limits
  60. GRB 070802, Swift-BAT refined analysis
  61. GRB 070802: V-band detection of the candidate afterglow
  62. GRB 070802: GROND J band candidate
  63. GRB 070731, Swift-BAT refined analysis
  64. Konus-A observation of GRB 070729
  65. Swift/UVOT detection of GRB070714B
  66. VLA upper limit on short hard burst GRB 070714B
  67. Intense burst from SGR 1806-20 detected on July 27
  68. GRB070729: Swift/UVOT upper limits
  69. GRB 070729: Swift-XRT refined analysis
  70. GRB 070729, Swift-BAT refined analysis
  71. GRB 070724B: P60 Observations
  72. GRB 070724B: Swift/UVOT Upper limits
  73. GRB 070724B: Swift-XRT afterglow likely candidate
  74. GRB 070721A: optical observations
  75. GRB 070724A: further VLT observations
  76. GRB 070724B: Suzaku WAM observation of the prompt emission
  77. GRB 070724B: Swift-XRT afterglow candidates
  78. Four radio sources in Swift-XRT error box of GRB 070724
  79. GRB 070724: P60 and Gemini Observations
  80. GRB 060814 - Keck host detection and redshift
  81. Swift/UVOT refined analysis of GRB070724
  82. GRB 070724: Swift-XRT Team refined analysis
  83. GRB 070724, Swift-BAT refined analysis of a short burst
  84. GRB 070721B: further observations and analysis
  85. GRB 070724: Swift detection of a burst
  86. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  87. GRB 070714B: Keck observations
  88. GRB 070721B: optical observations and proposed redshift
  89. GRB 070721B, Further Swift-BAT refined analysis
  90. Swift/UVOT Observations of GRB070721A
  91. GRB 070721B : Faulkes Telescope South observations
  92. GRB 070721B: Swift-XRT refined analysis
  93. GRB 070721A : Faulkes Telescope South optical limit
  94. GRB 070721A: Swift/XRT refined analysis
  95. GRB 070721B, Swift-BAT refined analysis
  96. GRB 070721A, Swift-BAT refined analysis
  97. GRB070721B: A bright UVOT candidate
  98. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  99. GRB 070714B : Suzaku WAM observation of the prompt emission
  100. GRB070714B: TNG NIR 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