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"

43688 results found.

  1. GRB 120521C: Swift-BAT refined analysis
  2. GRB 120521C: Keck Observations
  3. GRB 120521C: MASTER optical limit
  4. GRB 120521B: GROND Upper limits
  5. GRB 120521A: XRT light curve (Correction to GCN 13326)
  6. GRB 120521A: Swift-XRT refined Analysis
  7. GRB 120521C: PAIRITEL NIR Upper Limits
  8. GRB 120521C: Enhanced Swift-XRT position
  9. GRB 120521C: BOOTES-1 optical observations
  10. GRB 120521C: WHT optical observations
  11. GRB 120521C - NOT optical limits
  12. GRB120521C: Liverpool Telescope observations
  13. GRB 120521C: TAROT Calern observatory optical observations
  14. GRB 120521C: Swift detection of a burst
  15. GRB 120521B: Swift-BAT refined analysis
  16. GRB 120521B: Swift-XRT refined Analysis
  17. Konus-Wind observation of GRB 120519A
  18. Swift starts a new program to find fainter transients
  19. IPN Triangulation of GRB 120519A (short/hard)
  20. GRB 120521B: Enhanced Swift-XRT position
  21. GRB 120521A: Swift-BAT refined analysis
  22. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  23. GRB120521B: Faulkes Telescope South observations
  24. GRB 120521B: TAROT La Silla observatory optical observations
  25. GRB 120521B: Swift detection of a burst
  26. GRB 120521A: Enhanced Swift-XRT position
  27. GRB 120521A: TAROT La Silla observatory optical observations
  28. GRB 120521A: Swift detection of a short burst
  29. GRB 120514A : Suzaku WAM observation of the prompt emission
  30. GRB 120512A: A long GRB detected by INTEGRAL
  31. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  32. GRB 120514A: GROND upper limits
  33. GRB 120514A: Swift/UVOT Upper Limits
  34. GRB 120514A: UKIRT IR observations
  35. Konus-Wind observation of GRB 120510A
  36. GRB 120514A: Swift-XRT refined Analysis
  37. GRB 120514A: APEX observations of the submm counterpart
  38. GRB 120514A: Enhanced Swift-XRT position
  39. GRB 120514A: Swift-BAT refined analysis
  40. GRB 120514A: TAROT Calern observatory optical observations
  41. GRB 120514A: Swift detection of a burst
  42. GRB 120422A: Konkoly optical observations
  43. Fermi GBM Trigger 358364818 is not a GRB
  44. Fermi Trigger 358364818: BOOTES-4 observations
  45. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  46. GRB 120510A: Swift XRT and UVOT observations
  47. GRB 120510A: MASTER follow up observations
  48. GRB 120510A: MAXI/GSC detection of a burst
  49. GRB 120422A: SN identification from GTC
  50. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  51. GRB 120422A: P200 NIR detection
  52. GRB 120422A: CARMA 3mm observations
  53. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  54. GRB 120422A: Gemini-N detection of a supernova
  55. GRB 120422A: i-band re-brightening and possible SN detection
  56. GRB 120427A: MASTER follow up observations
  57. GRB 120422A: optical observations
  58. Konus-Wind observation of GRB 120427A
  59. IPN Triangulation of GRB 120427A
  60. Swift detection of 4U 1630-47
  61. GRB 120422A, the review of the sky area in plate archives
  62. Konus-Wind observation of GRB 120426A
  63. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  64. IPN Triangulation of bright GRB 120426A
  65. Swift Trigger 520928 is a noise event
  66. Swift Trigger 520928 is probably not a burst
  67. GRB 120424A: MAXI/GSC detection of a burst
  68. GRB 120422A: 272 GHz observations from SMA
  69. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  70. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  71. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  72. GRB 120422A GROND observations
  73. GRB 120422A: Super-LOTIS early observations
  74. GRB 120422A: EVLA Detection
  75. GRB 120422A: NOT optical observations
  76. GRB 120422A: Gemini redshift of candidate host
  77. GRB 120422A: Zadko observatory - Gingin optical observations
  78. GRB 120422A: Swift-XRT refined Analysis
  79. GRB 120422A: A Swift/UVOT Detection
  80. GRB 120422A: Enhanced Swift-XRT position
  81. GRB 120422A: Swift-BAT refined analysis
  82. GRB 120422A: Gemini observations
  83. GRB 120422A: Faulkes Telescope North observations
  84. GRB 120422A: Swift detection of a burst
  85. GRB 120419A: Swift-XRT and UVOT observations
  86. GRB 120419A: A long GRB detected by INTEGRAL
  87. Swift Trigger 519874 is a noise event
  88. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  89. Swift Trigger 519874 is probably a noise event
  90. Trigger 519868: Swift detection of SGR1806-20
  91. GRB 120404A: optical observations in Mondy observatory
  92. GRB 120404A: optical observations
  93. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  94. GRB 120404A: SMARTS optical/IR observations
  95. GRB 120404A: EVLA Detection
  96. GRB 120404A: MASTER OT observations
  97. GRB120404A: GROND observations show steeply decaying afterglow
  98. GRB120404A: MOA optical observations of the initial rise afterglow
  99. GRB 120404A: VLT/X-shooter redshift confirmation
  100. GRB 120404A: Swift/UVOT Detection

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