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"

19664 results found.

  1. GRB 070328: Swift detection of a burst
  2. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  3. GRB 070318: Gemini + Magellan spectra
  4. GRB070318: Swift UVOT continuing observations
  5. GRB070318: Swift-XRT refined analysis
  6. GRB 070318: Swift/UVOT Continued Observations
  7. GRB 070318, Swift-BAT refined analysis
  8. GRB 070318: Swift detection of a burst with an optical afterglow
  9. GRB 070311: Late Central Engine Activity Optical Flare??
  10. VLA observation of GRB 070311
  11. GRB 070309: variability of the XRT afterglow candidate
  12. GRB 070311: Swift/UVOT Upper Limits
  13. GRB 070311: Swift-XRT refined analysis
  14. GRB070309: Swift/XRT possible afterglow detection
  15. GRB 070125: Chandra X-ray Confirmation of Jet Break
  16. GRB 070309: Swift/UVOT Upper Limits
  17. Swift UVOT Finding Charts for GRB 070309
  18. GRB 070125: X-ray light curve analysis
  19. VLA observation of GRB 070306
  20. GRB 070306: NOT observations
  21. GRB 070306 Swift/UVOT refined analysis
  22. GRB 070306, Swift-BAT refined analysis
  23. GRB 070306: XRT Team Refined Analysis
  24. GRB070306 - SDSS Pre-burst Observations
  25. GRB 070306: Swift detection of a burst
  26. GRB070227: Swift-XRT refined analysis
  27. GRB 070125, deep late-time optical observation
  28. VLA observation of GRB 070224
  29. GRB 070227: optical observations
  30. GRB 070223: Optical Observations
  31. GRB 070227: optical observations
  32. GRB 070227: Swift/UVOT Upper Limits
  33. GRB 070227: TAROT La Silla observatory optical observations
  34. GRB 070227, Swift-BAT refined analysis
  35. GRB070227: possible X-ray afterglow detection
  36. GRB 070227: Swift detection of a burst in ground analysis
  37. GRB 070224: Optical afterglow confirmation
  38. GRB 070224: Swift/UVOT Upper Limits
  39. GRB070224: Swift-XRT Astrometrically Corrected Position
  40. VLA observation of GRB 070223
  41. VLA observation of GRB 070220
  42. GRB070224: Magellan Imaging Observations
  43. GRB070224: Gemini Imaging Observations
  44. GRB 070224: SARA upper limit
  45. GRB070224: Swift-XRT Refined Analysis
  46. GRB 070224, Swift-BAT refined analysis
  47. GRB 070224: MASTER-Net refind analysis
  48. GRB 070224: MASTER-VWF-Kislovodsk observations
  49. GRB 070224: Swift detection of a burst
  50. GRB070223: Swift/UVOT refined analysis
  51. GRB 070223, Swift-BAT refined analysis
  52. GRB070223: MASTER-VWF-Kislovodsk observations
  53. GRB 070223: Swift-XRT Refined Analysis
  54. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  55. GRB 070223: MDM Observations
  56. GRB070223: Swift burst
  57. Konus-Wind and Konus-A observations of GRB 070220
  58. GRB 070220 Swift-BAT Refined Analysis
  59. Swift/UVOT refined analysis of GRB070220
  60. GRB 070209: Swift XRT refined analysis
  61. GRB 070220: Swift-XRT Refined Analysis
  62. GRB 070220: Swift detection of a burst
  63. GRB070219: MASTER-VWF-Kislovodsk observations
  64. GRB 070219: XRT Refined Analysis
  65. GRB 070219: Swift/UVOT Upper limits
  66. GRB 070219, Swift-BAT refined analysis
  67. GRB 070219: ROTSE-III Optical Limits
  68. GRB070219 - SDSS Pre-Burst Observations
  69. GRB 070219: Swift detection of a burst
  70. Swift-BAT trigger 260304 is NOT a burst or transient
  71. GRB 070209: Swift XRT analysis
  72. GRB 070208: MARGE Optical Observations
  73. IPN localization of very bright long hard GRB 070207
  74. IPN localization of very intense short GRB 070201
  75. GRB 070209, Swift-BAT refined analysis of the short hard burst
  76. GRB 070209: Swift detection of a short hard burst
  77. GRB 070208: Swift XRT refined analysis
  78. GRB 070208: RAPTOR detection of early afterglow onset
  79. GRB 070208: MDM Optical Decay
  80. GRB 070208, Swift-BAT refined analysis
  81. GRB070208: Faulkes Telescope North Afterglow Identification
  82. GRB 070208: ROTSE-III Optical Limits
  83. GRB 070208: MDM Observations
  84. GRB 070208: Swift detection of a burst
  85. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  86. GRB070124: Swift-XRT Follow-up Observation
  87. GRB070126: Swift-XRT Observation
  88. GRB 070129: Swift/UVOT Upper limits
  89. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  90. GRB061217: MAGIC telescope GeV observation
  91. GRB 070129, Swift-BAT refined analysis of a particularly long
  92. GRB 070129: Swift-XRT Refined Analysis
  93. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  94. GRB 070129: Swift detection of a burst
  95. GRB 070126: Swift/UVOT refined analysis
  96. GRB070126: Swift-XRT possible detection of an afterglow
  97. GRB 070125: UVOT Detection in Ultraviolet Filters
  98. GRB 070126, Swift-BAT refined analysis of a very faint burst
  99. GRB070124: Swift-XRT Observation
  100. Possible GRB 070126: Swift/UVOT Upper Limit

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