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"

27833 results found.

  1. GRB 090529: CrAO optical upper limit
  2. GRB 090529: MTM-500 optical observations
  3. GRB 090529: Mt.Terskol optical observations
  4. XRF 090702: Swift-XRT refined analysis
  5. GRB 090703: Fermi GBM detection
  6. GRB 090702: UVOT upper limits
  7. XRF 090702: Swift-XRT afterglow position
  8. GRB 090701: Fermi GBM detection
  9. GRB 090628: Swift XRT refined analysis
  10. GRB 090630: Fermi GBM detection
  11. GRB 090618: RTT150 optical observations
  12. GRB 090628: Swift/UVOT Upper Limits
  13. GRB 090628: Swift-BAT refined analysis
  14. GRB 090628: GROND upper limits
  15. GRB 090628: Enhanced Swift-XRT position
  16. GRB 090626: IPN localization
  17. GRB 090628: Swift/UVOT Finding Chart Observation
  18. GRB 090628: Swift XRT position
  19. GRB 090628: Swift detection of a burst
  20. GRB 090625B: Swift/UVOT Upper Limits
  21. GRB 090625B: Swift-XRT refined analysis
  22. GRB 090626: Fermi GBM detection
  23. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  24. GRB 090625: Fermi GBM detection
  25. GRB 090621A: Enhanced Swift-XRT position
  26. GRB 090623: Fermi GBM detection
  27. GRB 090621B: GRT Optical Observation
  28. GRB 090621A: GRT Optical Observation
  29. PAIRITEL observations of GRB 090618
  30. GRB 090621B: Fermi GBM detection
  31. GRB 090621B: I-band observations from 1.23m CAHA
  32. GRB 090621D: Fermi GBM detection
  33. GRB 090621C: Fermi GBM detection
  34. GRB 090621: Fermi GBM observation
  35. GRB 090621B: Swift/UVOT Upper Limits
  36. GRB 090621B: Swift-BAT refined analysis
  37. GRB 090621B: Swift-XRT refined analysis
  38. GRB 090621B: RTT150 optical observations
  39. GRB 090618: RTT150 optical observations
  40. GRB 090621A: Swift-BAT refined analysis
  41. GRB 090621B: Swift detection of a short hard burst
  42. GRB 090621: Swift/UVOT Upper Limits
  43. GRB 090621: Swift-XRT Team refined analysis
  44. GRB090618: Spectrum and photometry from 6.0m BTA
  45. GRB 090621: Swift detection of a burst
  46. GRB 090618: ZTSh optical observations
  47. GRB 090618 : WSRT radio detection
  48. GRB090618, underlying supernova search
  49. GRB 090618: Fermi GBM observation
  50. GRB 090618, Swift-BAT refined spectral analysis
  51. VLA radio detection of GRB 090618
  52. GRB 090618 15GHz radio detection
  53. GRB090618 - Continued optical monitoring and light curve break
  54. GRB 090618: Swift-BAT refined analysis
  55. GRB090618: Swift-XRT team refined analysis
  56. GRB090618: Swift/UVOT bright afterglow detection
  57. GRB 090618: SDSS host detection
  58. Swift XRT observations of GRB 090531A
  59. GRB 090618: AGILE observations
  60. GRB 090617: Fermi GBM detection
  61. GRB 090618: LOAO R-band Observation
  62. GRB 090618: Enhanced Swift-XRT position
  63. GRB 090618 Faulkes Telescope North observations
  64. GRB 090618: ROTSE-III Detection of Optical Counterpart
  65. GRB090618: P60 Optical Afterglow
  66. GRB 090618: Swift detection of a bright burst with optical afterglow
  67. GRB 090616: Fermi GBM detection
  68. GRB 090612: Fermi GBM detection
  69. GRB 090610C: Fermi GBM detection
  70. GRB 090610B: Fermi GBM detection
  71. GRB 090610: Fermi GBM detection
  72. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  73. RXTE Discovery of Pulsations from SGR 0418+5729
  74. GRB 090531B: Fermi GBM detection
  75. Discovery of a new soft gamma repeater source, SGR 0418+5729
  76. GRB 090608: Fermi GBM detection
  77. GRB 090606: Fermi GBM detection
  78. GRB 090607: XRT Team Refined Analysis
  79. GRB 090607: Swift/UVOT Upper Limits
  80. GRB 090607: Swift-BAT refined analysis of the SHB
  81. GRB 090607: Faulkes Telescope North observations
  82. GRB 090607: Swift detection of a burst
  83. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  84. GRB 090530: RTT150 Optical Observation
  85. GRB 090602: Fermi GBM detection
  86. GRB 090529A: RTT150 Optical Observations
  87. GRB 090531B: GROND observation
  88. GRB 090530: Early RAPTOR Optical Observations
  89. GRB 090531B: Swift/BAT spectral lag results
  90. GRB 090529C: Fermi GBM detection
  91. GRB 090529B: Fermi GBM detection
  92. GRB 090530B: Fermi GBM detection
  93. Corrections to GRB 090531B Swift/UVOT Upper Limits
  94. GRB 090531B, RIMOTS optical upper limits
  95. GRB 090531B: Swift/UVOT Upper Limits
  96. GRB 090530: GRT Optical Observation
  97. GRB 090531B: Swift-BAT refined analysis
  98. Initial Swift/UVOT observations of GRB 090531B
  99. GRB 090531B: Swift-XRT candidate afterglow position
  100. GRB 090531B: ROTSE-III Optical Limits

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