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"

26483 results found.

  1. GRB 050408: Kuiper 1.5m observations
  2. GRB 050412: optical observations
  3. GRB 050408: refined XRT analysis, no jet break seen yet
  4. GRB 050412 : XingLong optical observation
  5. GRB 050412: Swift-BAT refined analysis
  6. GRB 050412: ANU 2.3m observations
  7. GRB 050408: SDSS Field Calibration
  8. GRB 050412: LCO Optical Observations
  9. GRB050412: P60 Observations
  10. GRB050412: optical limit before and during GRB
  11. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  12. GRB 050408: Optical limit
  13. GRB 050408: PROMPT VRcIc Observations
  14. GRB050410: MASTER optical observations
  15. GRB 050408: Inconsistency of host galaxy identification
  16. GRB 050408: Subaru Observations
  17. GRB 050408: WIDGET simultaneous optical observations
  18. GRB 050408: SOAR UBVRc Observations
  19. GRB 050408: Properties of the Host Galaxy
  20. GRB 050408: Mercator Optical Observations
  21. GRB 050408, SMARTS optical/IR afterglow observations
  22. GRB 050408,optical observation
  23. GRB 050408 Optical Observations
  24. GRB 050408: Mercator Optical Observations
  25. GRB 050408: Magellan astrometry and photometry
  26. GRB 050408: steepening of the optical decay
  27. GRB 050408 optical candidate
  28. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  29. GRB050408: MASTER optical observations
  30. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  31. GRB 050406 BAT refined analysis
  32. Konus-Wind observation of GRB 050401
  33. GRB050401: Radio observation at 610 MHz with GMRT
  34. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  35. GRB 050401 Optical Observations
  36. GRB 050401 BAT refined analysis
  37. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  38. GRB 050401: Prompt XRT position
  39. GRB 050331: Swift XRT Position
  40. Konus-Wind observation of GRB 050326
  41. GRB050326: optical limit
  42. GRB050326: optical limit 33min before GRB
  43. GRB 050326 BAT refined analysis
  44. GRB050326: delayed XRT observation
  45. GRB050319, optical observations
  46. GRB050319, color indices
  47. GRB 050319: ROTSE-III Refined Analysis
  48. GRB 050319 R band observations
  49. GRB 050319: Swift-UVOT detection of the afterglow
  50. GRB 050319: NIR afterglow candidate
  51. GRB 050319:Near IR afterglow
  52. GRB 050319: Optical observation
  53. GRB050319,optical observation
  54. Swift Detection of GRB 050319
  55. GRB 050318: Swift/UVOT detection of afterglow emission
  56. GRB050318: Swift XRT position
  57. GRB050223: analysis of the XMM-Newton observation
  58. GRB050316: MASTER before, simultanious and follow up optical
  59. GRB 050306: ROTSE-III early limits
  60. GRB050316: MASTER optical observations
  61. GRB 050315: Swift-BAT further refined analysis
  62. GRB 050315, SMARTS optical/IR afterglow observations
  63. GRB050315: Radio afterglow
  64. GRB 050315: Swift XRT Position
  65. GRB 050315: Early Observations with Swift/UVOT
  66. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  67. GRB 050306: optical afterglow
  68. Swift-BAT trigger 107873: No Swift XRT counterpart
  69. GRB 050306: Confirmation of X-ray afterglow
  70. GRB 050309, Early optical limits from RAPTOR
  71. GRB 050306: further TAROT optical data
  72. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  73. GRB 050306: TAROT optical observations
  74. Ongoing activity of SGR 1806-20 after the giant flare
  75. GRB050215B: Late-Time Swift UVOT Observations
  76. GRB 050126: Confirmation of the NIR afterglow candidate
  77. PROMPT VRcIc Observations of GRB 050223
  78. GRB 050219b: candidate NIR afterglow
  79. IBAS GRB Alert #2321
  80. GRB 050223: optical observations
  81. INTEGRAL detection of GRB 050223
  82. GRB050223: ROTSE-III Optical Observations
  83. GRB050219b: CORRECTION to time of UVOT observations
  84. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  85. GRB 050219b: Swift-BAT detection of a burst
  86. GRB 050219b: CORRECTION: Swift XRT Position
  87. GRB 050219b: Swift XRT Position
  88. GRB 050219a, optical observations
  89. GRB050215b: Swift UVOT Detection of Afterglow Emission
  90. GRB 050215b: XRT confirmation of IR afterglow candidate
  91. GRB050215b: P60 Optical Observations
  92. GRB 050215B: candidate afterglow
  93. GRB 050215b : Lulin follow-up observation
  94. GRB 050215B: UKIRT K-band imaging
  95. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  96. GRB050215A: ROTSE-III Optical Observations
  97. GRB 050209(=U11568): Duration and spectrum
  98. short/hard GRB 050202, optical observations
  99. GRB050209: REM optical observations
  100. GRB 050209 Optical observations

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