Skip to main content
Passing of Scott Barthelmy, GCN Founder See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"
  1. Swift/UVOT refined analysis of GRB080212
  2. GRB 080212, Swift-BAT refined analysis
  3. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  4. GRB 080212: Gemini-South optical observations
  5. GRB 080212: GROND detects afterglow
  6. GRB 080212: REM NIR afterglow?
  7. GRB 080212: optical observations
  8. GRB 080212: Enhanced Swift-XRT position
  9. GRB 080212: Swift-XRT Team refined analysis
  10. GRB 080210: Keck photometry
  11. VLA non-detection of GRB 080210
  12. GRB 080212: Swift detection of a burst
  13. IPN localization of GRB 080211
  14. GRB 080212: DSS/2MASS Galaxy at XRT position
  15. GRB 080207: VLT NIR early upper limits
  16. GRB 080210: Swift/UVOT Refined Analysis
  17. GRB 080207: optical observations.
  18. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  19. GRB 080210, Swift-BAT refined analysis
  20. GRB 080210: Super-LOTIS observations
  21. GRB 080210: Swift-XRT Refined Analysis
  22. GRB 080210: VLT redshift
  23. GRB 080210: Enhanced Swift-XRT position
  24. GRB 080210: Rapid PROMPT Detections
  25. GRB 080210: GOND detection in all bands and redshift upper limit
  26. GRB080210 - SDSS Pre-Burst Observations
  27. GRB 080210: Swift detection of a burst with optical afterglow
  28. GRB 080210: TAROT La Silla observatory optical detection
  29. GRB 080207: GROND upper limits
  30. GRB 080205: GAO 150cm telescope Optical limit
  31. GRB 080207, Swift-BAT refined analysis
  32. GRB 080207: Optical limits from Gemini-South
  33. GRB 080205: RTT150 optical observations
  34. Swift detection of AX J1749.1-2639
  35. GRB 080207: Super-LOTIS observations
  36. GRB 080207, Swift-BAT refined analysis
  37. Swift Trigger 302777 is not a GRB
  38. GRB080207: RTT150 Optical Observations
  39. GRB 080207: REM NIR observations
  40. GRB080207: Swift/UVOT refined analysis
  41. GRB 080207: TAROT Calern observatory optical observations
  42. GRB 080207: Swift-XRT Refined Analysis
  43. GRB 080207: Enhanced Swift-XRT position
  44. GRB 080207: Swift detection of a burst
  45. Konus-Wind observation of GRB 080204
  46. GRB 080205 optical upper limit
  47. GRB 080205: MASTER optical observation
  48. GRB 080205: optical observation
  49. VLA radio upper limit on GRB 080205
  50. INT+WFC R-band observations of GRB 080205
  51. GRB 080205, Swift-BAT refined analysis
  52. IPN localization of very hard GRB 080204
  53. GRB 080205: Swift XRT refined analysis
  54. GRB 080205: OA evolution from KAIT observations
  55. GRB 080205: Swift/UVOT observations
  56. GRB 080205: Enhanced Swift-XRT position
  57. GRB 080205: KAIT OA detection
  58. GRB 080205: Swift detection of a burst
  59. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  60. GRB 080130: Swift-BAT refined analysis
  61. GRB 080130: further Swift XRT observations confirm fading source
  62. GRB 080129: Swift/UVOT Refined Upper Limits
  63. Swift/UVOT observations of GRB080130
  64. GRB 080130: REM NIR observations
  65. GRB 080130(?): Swift XRT observation
  66. GRB 080130?: Detection of a possible burst by BATSS
  67. GRB 080129: Optical observations from OSN
  68. GRB 080129: Swift-XRT refined analysis
  69. X-ray transient in NGC 2770: RTT150 optical observations
  70. GRB 080129: KAIT optical limits
  71. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  72. GRB 080129: optical limit by Pi of the Sky
  73. GRB 080129, Swift-BAT refined analysis
  74. GRB 080129: TAROT La Silla observatory optical observations
  75. GRB 080129: Gemini-South photometry
  76. GRB 080129: GROND detection in all bands, and fading
  77. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  78. GRB 080129: Enhanced Swift-XRT position
  79. GRB 080129: Gemini-South Imaging Observations
  80. GRB 080129: Swift XRT position
  81. GRB 080129 (?): UVOT Upper Limits
  82. GRB 080129 (?): Swift detection of a possible burst
  83. A new website of high-level data products for Swift GRBs
  84. GRB 080121: Upper limit on X-ray afterglow
  85. GRB 080123 : Suzaku WAM observation of the prompt emission
  86. Swift trigger(=301779) is not a GRB
  87. Transient 080109/SN 2008D: Spectroscopic Evolution
  88. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum
  89. Konus-Wind observation of GRB 080122
  90. GRB 080122 : Suzaku WAM observation of the prompt emission
  91. GRB 080121: Swift/UVOT upper limits
  92. SNe 2008D and 2007uy: Chandra Detections
  93. GRB 080121 position was incorrect
  94. GRB 080121: Enhanced Swift-XRT position
  95. Two non-burst Swift SubThreshold triggers
  96. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  97. IPN triangulation of GRB080122
  98. GRB 080121: Nearby SDSS galaxies
  99. GRB 080121: Swift-BAT detection of a very weak, short burst
  100. GRB 080123: Swift-XRT refined analysis

Advanced

Download all Circulars as a .tar.gz archive:
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