Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
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"
  1. GRB 130216B BAT refined analysis
  2. GRB 130216B: P200 NIR Observations
  3. GRB 130216A: P200 NIR Observations
  4. GRB 130216A: Swift-BAT refined analysis
  5. GRB 130216A: TAROT La Silla observatory optical observations
  6. GRB 130215A: Additional P200 NIR observations
  7. GRB 130216B: Burst found in ground analysis of BAT data
  8. GRB 120118B: host observations and redshift determination
  9. GRB 130216A: OSN I-band observations
  10. GRB 130216A: Swift detection of a burst
  11. GRB 130215A: P200 NIR observations
  12. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  13. GRB 130215A: MITSuME Okayama Optical Observation
  14. GRB 130215A: Fermi GBM detection
  15. GRB 130215A: RAPTOR Measurements
  16. GRB 130215A: GMG optical observation
  17. GRB 130215A: iTelescope T11 observations
  18. GRB 130215A: Xinglong optical observations
  19. GRB 130215A: Swift-BAT refined analysis
  20. GRB 130215A: TAROT La Silla observatory optical observations
  21. GRB 130215A: RATIR Optical and NIR Observations
  22. GRB 130215A: REM NIR observations
  23. GRB 130215A: CARMA 3mm detection
  24. GRB 130215A: P60 Observations
  25. GRB 130215A: ROTSE-III data analysis
  26. GRB 130215A: Redshift estimate
  27. Skynet Observations of GRB130215
  28. GRB 130215: ROTSE-III Detection of Optical Counterpart
  29. GRB 130215A: Swift detection of a burst
  30. Swift GRB130206A: late XRT observations.
  31. GRB 130131B: CTIO 0.9-m optical upper-limits
  32. GRB 121128A: optical observations
  33. GRB 121123A: optical observations
  34. GRB 130211A: Swift/UVOT Upper Limits
  35. GRB 130211A: Swift-XRT refined Analysis
  36. GRB 130211A: Swift-BAT refined analysis
  37. GRB 130211A: GROND detection of the afterglow
  38. GRB 130211A: Swift detection of a burst
  39. GRB 130131A: MITSuME Akeno Optical upper limits
  40. GRB 130131B: MITSuME Akeno Optical upper limits
  41. GRB 130122A: PTF P48 optical upper limits
  42. GRB 130206A: GROND Observations
  43. GRB 130206A: Fermi LAT Observations
  44. GRB 130206A: Fermi GBM observation
  45. GRB 130206A: XRT and UVOT follow-up observations.
  46. GRB 130131B: optical upper limit in Mondy observatory
  47. GRB 130206A, Swift-BAT refined analysis
  48. GRB 130206A: Zadko observatory - Gingin optical observations
  49. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  50. GRB 130206A: Swift-XRT observations
  51. GRB 130131A: optical observation in Mondy observatory
  52. GRB 130206A: Swift detection of a burst
  53. GRB 130131A: Swift/UVOT Upper Limits
  54. GRB 130131B: RATIR Upper Limits
  55. GRB 130131A: RATIR optical and infrared upper limits
  56. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  57. GRB 130131B: Swift-XRT refined Analysis
  58. GRB 130131A - UKIRT confirmation of afterglow
  59. GRB 130131B: VLT/X-shooter acquisition camera limits
  60. GRB 130131B: GROND Upper limits
  61. GRB 130131A: CARMA 3mm Observations
  62. GRB 130131A: VLA 5.8 Ghz Detection
  63. GRB 130131B: IAC80 I-band observations
  64. GRB 130131B: Swift/UVOT Upper Limits
  65. GRB 130131A: Swift-XRT refined Analysis
  66. GRB 130131B: MITSuME Okayama optical upper limits
  67. GRB 130131A: MITSuME Okayama optical upper limits
  68. GRB 130131B: Enhanced Swift-XRT position
  69. GRB 130131B: Swift-BAT refined analysis
  70. GRB 130131A: Swift-BAT refined analysis
  71. GRB 130131B: TAROT Calern observatory optical observations
  72. GRB 130131B: Zadko observatory - Gingin optical observations
  73. GRB 130131A: Enhanced Swift-XRT position
  74. GRB 130131B: Swift detection of a burst
  75. GRB 130131A - Faulkes Telescope North Observations
  76. GRB 130131A - UKIRT afterglow candidate
  77. GRB 130131A: Swift detection of a burst
  78. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  79. GRB 130127A: Fermi GBM detection
  80. Swift Trigger 547142: MAXI/GSC upper limit
  81. GRB 130122A: RTT150 optical observations
  82. Swift Trigger 547142: a probable Galactic source
  83. GRB 130122A: CARMA 3mm Observations
  84. GRB 130122A: Swift/UVOT Detection
  85. GRB 130122A: optical observations
  86. GRB 130122A: RATIR Detection
  87. GRB 130122A: Swift-BAT refined analysis
  88. GRB 130122A: Swift-XRT refined Analysis
  89. GRB 130122A: Xinglong optical upper limit
  90. GRB 130122A: Enhanced Swift-XRT position
  91. GRB 130122A: MASTER-Net early marginal detection of the OT
  92. GRB 130122A: T100 observations
  93. GRB 130122A: Swift detection of a burst with an optical counterpart
  94. Short GRB 121226A: TNG observation of the host galaxy
  95. GRB 121225B: Suzaku WAM observation of the prompt emission
  96. GRB 130102B: MASTER synchronous observations
  97. GRB 130102A: Swift/UVOT Upper Limits
  98. Konus-Wind observation of GRB 130102B
  99. GRB 130102A: P60 Observations
  100. GRB 130102A: Swift-BAT refined analysis

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