Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

41955 results found.

  1. GRB 060501: Swift detection of a burst
  2. Konus-Wind observation of GRB 060427B
  3. GRB060428B - SDSS Pre-Burst Observations
  4. GRB060428B: optical observation
  5. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  6. GRB 060428B: MDM Observations
  7. GRB 060428A: PROMPT Observations
  8. GRB 060427B: MASTER optical observations
  9. GRB060428B: Swift XRT Team refined analysis
  10. GRB 060427B: IPN localization of a short hard burst
  11. GRB 060428B: Refined analysis of the Swift-BAT burst
  12. GRB 060428B: Xinglong I-band limit
  13. GRB 060428B: KAIT observations
  14. GRB060425:MASTER optical limit
  15. GRB 051117A: Bright host galaxy not confirmed
  16. GRB060428A: Swift/UVOT observations.
  17. GRB060428B, optical observation
  18. GRB 060428A: Refined analysis of the Swift-BAT burst
  19. GRB 060428b : Kiso R-band limit
  20. GRB 060428b: Optical afterglow candidate
  21. GRB060428A: Swift XRT Team refined analysis
  22. GRB 060428B: Swift detection of a burst
  23. GRB 060427: NIR observations
  24. GRB060427: Xinglong optical Observations
  25. GRB 060428: Swift detection of a burst
  26. GRB 060427: NOT observations
  27. GRB 060427: Swift/UVOT upper limits.
  28. GRB060427: Swift XRT Team refined analysis
  29. GRB060418: Swift XRT Team Further Refined Analysis
  30. GRB060425:MASTER survey observations
  31. GRB 060427, optical observation
  32. GRB 060427: Swift detection of a burst
  33. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  34. An interactive program for GRB pseudo-redshift computations
  35. GRB060424: optical afterglow detection
  36. GRB060418: Further Analysis of MIKE Spectroscopy
  37. GRB 060424: Refined analysis of the Swift-BAT burst
  38. GRB 060424: Swift detection of a burst
  39. GRB 060421: TTT Observations
  40. OT 060420: Likely Not a New Cosmic Transient
  41. No OT 060420 in MASCOT images
  42. Swift-BAT detection of Mrk 421
  43. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  44. GRB060421: Swift/UVOT observations
  45. GRB 060421: Swift-XRT refined analysis
  46. GRB 060418: prediction of t_break
  47. GRB060418: optical observations
  48. Konus-Wind observation of GRB 060418
  49. GRB(?)060421 : XRT position
  50. GRB(?) 060421: Swift detection of a burst
  51. Erratum of GCN 4983 for GRB 060418 IR follow-up
  52. GRB 060418 : IR afterglow observations
  53. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  54. GRB 060418: Radio Observations
  55. GRB060418, BVRcIc field calibration
  56. GRB060418: Swift/UVOT Observations
  57. GRB060418: Optical Observations
  58. GRB 060418: FRAM early afterglow observation
  59. GRB 060418: Refined Analysis of the Swift-BAT burst
  60. VLT/UVES observations of GRB060418
  61. GRB060418: Swift XRT Team Refined Analysis
  62. GRB 060418, SMARTS continuing afterglow observations
  63. GRB 060418: PROMPT Detections
  64. GRB 060418, SMARTS optical/IR afterglow observations
  65. GRB060418: Magellan/MIKE Spectroscopic Redshift
  66. GRB 060418: REM candidate afterglow
  67. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  68. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  69. GRB 060413: REM NIR Observations
  70. SGR 1900+14: Swift detection of an outburst
  71. GRB 060413: Watcher UBVR observations
  72. GRB 060413: XRT refined analysis
  73. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  74. GRB 060413: Swift detection of a burst
  75. GRB060403: optical observations
  76. GRB 060403 Optical observations
  77. GRB 060403: MITSuME optical observation
  78. GRB060403: Optical Limit
  79. GRB060403: XRT refined analysis
  80. GRB 060403: Swift/UVOT upper limits
  81. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  82. SGR 1900+14: BAT observations
  83. GRB060403: Swift XRT refined position
  84. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  85. GRB 060403: Swift detection of a burst
  86. HETE trigger H4044: RTT150 optical observations
  87. GRB060331: Swift/UVOT upper limits
  88. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  89. Swift XRT observations of the HETE transient H4043
  90. H4043, an unusual high-energy transient observed by HETE
  91. GRB 060322: LNA optical limit
  92. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  93. INTEGRAL and XMM ToO observations of SGR1900+14
  94. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  95. SGR 1900+14: Swift-BAT detection of a bright outburst
  96. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  97. GRB 060323 : WIDGET simultaneous optical observations
  98. GRB 060323: Early optical observation at Xinglong
  99. GRB060218, optical observations
  100. GRB 060322: Confirmation of Swift XRT afterglow

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