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"

23620 results found.

  1. GRB 070328, Swift-BAT refined analysis
  2. GRB 070328: Swift detection of a burst
  3. GRB 070311, deep optical photometry
  4. Short-Hard GRB 070209: PROMPT Observations
  5. GRB070318: Swift UVOT continuing observations
  6. GRB 070318, Swift-BAT refined analysis
  7. GRB 070318: Swift detection of a burst with an optical afterglow
  8. GRB 070311: Tautenburg sees afterglow fading
  9. IBAS Alert n. 4169: not a GRB
  10. GRB 070311: MITSuME Okayama Optical Observation
  11. GRB 070311: a long GRB detected by INTEGRAL
  12. GRB 070125: Chandra X-ray Confirmation of Jet Break
  13. GRB 070306, optical observation
  14. GRB 070309: A long GRB detected by INTEGRAL
  15. GRB 070306: NOT observations
  16. GRB 070306 Swift/UVOT refined analysis
  17. GRB070306: confirmation of near infrared afterglow
  18. GRB 070306: ART-3 early optical and near infrared constraints
  19. GRB 070306: IR observations and candidate afterglow
  20. GRB 070306, Swift-BAT refined analysis
  21. GRB 070306: Optical and IR observations with KANATA
  22. GRB070306 - SDSS Pre-burst Observations
  23. GRB 070306: Swift detection of a burst
  24. GRB 070223: NIR observations at WHT
  25. GRB 070125, deep late-time optical observation
  26. GRB 070227: optical observations
  27. GRB 070223: Optical Observations
  28. GRB 070227: optical observations
  29. GRB 070227: TAROT La Silla observatory optical observations
  30. GRB 070227, Swift-BAT refined analysis
  31. GRB 070227: Swift detection of a burst in ground analysis
  32. GRB 920925C: optical afterglow candidate
  33. GRB 070224: Swift/UVOT Upper Limits
  34. GRB070224: Swift-XRT Astrometrically Corrected Position
  35. GRB 070224: WHT K-band imaging
  36. GRB070224: Gemini Imaging Observations
  37. GRB 070224: SARA upper limit
  38. GRB 070224, Swift-BAT refined analysis
  39. GRB 070224: Swift detection of a burst
  40. RHESSI Spectrum of GRB070220
  41. GRB 070223: Optical-IR observation with KANATA
  42. GRB 070223, Swift-BAT refined analysis
  43. GRB070223 - SDSS Pre-Burst Observations
  44. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  45. GRB070223: Swift burst
  46. Konus-Wind and Konus-A observations of GRB 070220
  47. GRB 070220: MITSuME Okayama Optical Observation
  48. GRB 070220: ART-3 Optical and NIR limits
  49. GRB 070220 Swift-BAT Refined Analysis
  50. Swift/UVOT refined analysis of GRB070220
  51. GRB 070209: Swift XRT refined analysis
  52. GRB 070220: Swift-XRT Refined Analysis
  53. GRB 070220: Observation with the KANATA 1.5m telescope
  54. GRB 070220 : Faulkes Telescope North optical limit
  55. GRB 070220: Swift detection of a burst
  56. GRB 070219: XRT Refined Analysis
  57. GRB 070219: I-band observations
  58. GRB 070219, Swift-BAT refined analysis
  59. GRB 070219: optical TNG observations
  60. GRB 070219: Liverpool Telescope Observations
  61. GRB 070219: ROTSE-III Optical Limits
  62. GRB070219 - SDSS Pre-Burst Observations
  63. GRB 070219: Swift detection of a burst
  64. Swift-BAT trigger 260304 is NOT a burst or transient
  65. GRB 060927: PROMPT Observations
  66. GRB 070125: Break in Optical Decay
  67. GRB 070209: Swift XRT analysis
  68. GRB 070208: MARGE Optical Observations
  69. IPN localization of very bright long hard GRB 070207
  70. IPN localization of very intense short GRB 070201
  71. GRB 070209, Swift-BAT refined analysis of the short hard burst
  72. GRB 070209: Swift detection of a short hard burst
  73. GRB 070208: Swift XRT refined analysis
  74. GRB 070208, Swift-BAT refined analysis
  75. GRB070208 - SDSS Pre-Burst Observations
  76. GRB070208: Faulkes Telescope North Afterglow Identification
  77. GRB 070208: Swift detection of a burst
  78. GRB 070125 detection with CARMA
  79. GRB 070129: Swift/UVOT Upper limits
  80. GRB061217: MAGIC telescope GeV observation
  81. GRB 070129, Swift-BAT refined analysis of a particularly long
  82. GRB 070129: VLT observations
  83. GRB 070129: Swift detection of a burst
  84. GRB 070125: MITSuME Okayama optical observation
  85. GRB 070125: AAVSO optical observations
  86. GRB 070125: PROMPT detections
  87. GRB 070124: Suzaku WAM observation of the prompt emissions
  88. GRB 070125: UVOT Detection in Ultraviolet Filters
  89. GRB 070126, Swift-BAT refined analysis of a very faint burst
  90. GRB070125: Optical observation by Kanata
  91. GRB070124: Swift-XRT Observation
  92. GRB 070126?: Swift detection of a possible burst
  93. RHESSI Spectrum of GRB070125
  94. IPN-BAT localization of GRB070125 (very long duration, intense)
  95. Konus-Wind observation of short hard GRB 070124
  96. IPN localization of GRB070124 (short duration, hard spectrum)
  97. GRB 070110: Continued Detection and Request for Ground Followup
  98. GRB 050904: Second Epoch of HST/NICMOS Observations
  99. GRB 070110: Ep,i - Eiso correlation
  100. GRB 070107: Suzaku WAM observation of the prompt emission

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