Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

36397 results found.

  1. GRB 120528B: MAXI/GSC detection
  2. GRB 120512A: Suzaku WAM observation of the prompt emission
  3. GRB 120521C: EVLA Localization of Afterglow
  4. GRB 120521C: EVLA 22 GHz Detection
  5. GRB120521B: SSO 2.3m upper limits
  6. Konus-Wind observation of GRB 120522A
  7. IPN triangulation of GRB 120522A (long/intense)
  8. GRB 120521B: Fermi GBM observation
  9. GRB 120521A: ATCA 34GHz upper limit
  10. GRB 120521C: Early Tautenburg limits
  11. GRB 120521C: EVLA 22 GHz Upper Limit
  12. GRB 120521A: GROND Upper limits
  13. GRB 120521C: Swift-XRT refined Analysis
  14. GRB 120521C: Swift-BAT refined analysis
  15. GRB 120521C: Keck Observations
  16. GRB 120521C: Swift/UVOT Upper Limits
  17. GRB 120521B: Swift/UVOT Upper Limits
  18. GRB 120521C: MASTER optical limit
  19. GRB 120521B: GROND Upper limits
  20. GRB 120521A: XRT light curve (Correction to GCN 13326)
  21. GRB 120521A: Swift-XRT refined Analysis
  22. GRB 120521C: PAIRITEL NIR Upper Limits
  23. GRB 120521C: Enhanced Swift-XRT position
  24. GRB 120521C: BOOTES-1 optical observations
  25. GRB 120521C: WHT optical observations
  26. GRB 120521C - NOT optical limits
  27. GRB120521C: Liverpool Telescope observations
  28. GRB 120521C: TAROT Calern observatory optical observations
  29. GRB 120521C: Swift detection of a burst
  30. GRB 120521B: Swift-BAT refined analysis
  31. GRB 120521B: Swift-XRT refined Analysis
  32. Konus-Wind observation of GRB 120519A
  33. Swift starts a new program to find fainter transients
  34. IPN Triangulation of GRB 120519A (short/hard)
  35. GRB 120521A: Swift/UVOT Upper Limits
  36. GRB 120521B: Enhanced Swift-XRT position
  37. GRB 120521A: Swift-BAT refined analysis
  38. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  39. GRB 120521B: TAROT La Silla observatory optical observations
  40. GRB 120521B: Swift detection of a burst
  41. GRB 120521A: Enhanced Swift-XRT position
  42. GRB 120521A: TAROT La Silla observatory optical observations
  43. GRB 120521A: Swift detection of a short burst
  44. GRB 120514A : Suzaku WAM observation of the prompt emission
  45. GRB 120512A: A long GRB detected by INTEGRAL
  46. GRB 120514A: GROND upper limits
  47. GRB 120514A: Swift/UVOT Upper Limits
  48. GRB 120514A: UKIRT IR observations
  49. Konus-Wind observation of GRB 120510A
  50. GRB 120514A: Swift-XRT refined Analysis
  51. GRB 120514A: APEX observations of the submm counterpart
  52. GRB 120514A: Enhanced Swift-XRT position
  53. GRB 120514A: Swift-BAT refined analysis
  54. GRB 120514A: TAROT Calern observatory optical observations
  55. GRB 120514A: Swift detection of a burst
  56. GRB 120422A: Konkoly optical observations
  57. Fermi GBM Trigger 358364818 is not a GRB
  58. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  59. GRB 120510A: Swift XRT and UVOT observations
  60. GRB 120510A: MASTER follow up observations
  61. GRB 120510A: MAXI/GSC detection of a burst
  62. GRB 120422A: SN identification from GTC
  63. GRB 120422A: P200 NIR detection
  64. GRB 120422A: CARMA 3mm observations
  65. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  66. GRB 120422A: Gemini-N detection of a supernova
  67. GRB 120422A: i-band re-brightening and possible SN detection
  68. GRB 120427A: MASTER follow up observations
  69. GRB 120422A: optical observations
  70. Konus-Wind observation of GRB 120427A
  71. IPN Triangulation of GRB 120427A
  72. GRB 120422A, the review of the sky area in plate archives
  73. Konus-Wind observation of GRB 120426A
  74. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  75. IPN Triangulation of bright GRB 120426A
  76. GRB 120422A: MITSuME Ishigakijima upper limit
  77. Swift Trigger 520928 is probably not a burst
  78. GRB 120424A: MAXI/GSC detection of a burst
  79. GRB 120422A: 272 GHz observations from SMA
  80. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  81. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  82. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  83. GRB 120422A GROND observations
  84. GRB 120422A: Super-LOTIS early observations
  85. GRB 120422A: EVLA Detection
  86. GRB 120422A: Xinglong TNT optical upper limit
  87. GRB 120422A: NOT optical observations
  88. GRB 120422A: Gemini redshift of candidate host
  89. GRB 120422A: Zadko observatory - Gingin optical observations
  90. GRB 120422A: Swift-XRT refined Analysis
  91. GRB 120422A: A Swift/UVOT Detection
  92. GRB 120422A: Enhanced Swift-XRT position
  93. GRB 120422A: Swift-BAT refined analysis
  94. GRB 120422A: Gemini observations
  95. GRB 120422A: Faulkes Telescope North observations
  96. GRB 120422A: Swift detection of a burst
  97. GRB 120419A: Swift-XRT and UVOT observations
  98. GRB 120419A: A long GRB detected by INTEGRAL
  99. GRB 120404A: optical observations in Mondy observatory
  100. GRB 120404A: optical 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