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"

39361 results found.

  1. GRB 050713B: Swift-BAT Refined Analysis
  2. Swift-BAT Trigger 145729 is not a GRB
  3. GRB 050713A: Swift/UVOT observation
  4. GRB 050713A : Swift-BAT Refined Analysis
  5. GRB 050713A : Lulin R-band observation
  6. GRB 050713A XMM-Newton observation
  7. GRB 050713b : Lulin R-band observations
  8. GRB050713B: Faulkes North Telescope observation
  9. RBO RI observations of GRB 050713A
  10. GRB 050713B
  11. GRB050709 : Chandra source optical counterpart
  12. GRB050713: Liverpool Telescope prompt observations
  13. GRB 050712, optical observations
  14. GRB 050713 : Planned XMM-Newton observation
  15. GRB050709: Candidate X-ray Afterglow from Chandra
  16. GRB 050713, R-band observations at NOT
  17. GRB 050713: ARC NIR Detections and Identification of Fading
  18. GRB050713: possible I-band afterglow
  19. GRB 050713: Swift detection of Bright Burst
  20. GRB 050713A: ROTSE-III Optical Limits
  21. GRB 050709: Swift UVOT and XRT observations
  22. GRB 050712: Swift-BAT Refined Analysis
  23. GRB 050712: Swift XRT afterglow position
  24. GRB 050712: Swift detection of a weak burst
  25. GRB 050709: LCO40 Observations
  26. GRB050709: A Possible Short-Hard GRB Localized by HETE
  27. PROMPT Rc Observations of GRB 050709
  28. GRB 050525a: PROMPT VRcIc Detections
  29. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  30. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  31. GRB 050626 optical observations
  32. GRB 050626: Swift XRT observations
  33. GRB 050701
  34. GRB 050701, optical observations
  35. GRB 050408: ARC 3.5-meter NIR Observations
  36. GRB 050701: Refined XRT analysis
  37. Swift UVOT observations of GRB 050701
  38. GRB 050701: Swift XRT afterglow position
  39. Swift trigger 143708 is really GRB 050701
  40. GRB 050607, radio observations
  41. GRB 050626 - Correction to GCN 3552
  42. GRB 050626 - a long GRB detected with INTEGRAL
  43. GRB 050525A: Swift Late-Time Decay Rate
  44. H3804: A Possible New XRB Detected by HETE
  45. XRF 050509c: Optical monitoring
  46. IBAS Alert #2512 is NOT a GRB
  47. GRB 050416(a): Host Galaxy Redshift Determination
  48. GRB 050607: MDM Observation
  49. GRB 050607 optical decay
  50. GRB 050607: RTT150 optical observations
  51. GRB 050607 : Lulin R-band observation
  52. GRB 050607: PROMPT VRcIc Observations
  53. GRB 050607: RAPTOR-S Early Optical Limits
  54. GRB 050525a, Mid-Infrared Observations
  55. GRB 050607: Optical decay and spectral slope
  56. GRB 050607: MDM Observations
  57. GRB050607,optical observation
  58. GRB 050607 - XRT refined data analysis
  59. Optical Afterglow of GRB 050607
  60. GRB050607 optical limit by "Pi of the Sky"
  61. GRB050607: Swift Detection of a long GRB
  62. GRB050607: P60 Observations
  63. GRB050607: prompt REM observations
  64. GRB 050603: prediction of t_break
  65. Limits on a SN in the field of GRB 050509b
  66. GRB 050603: Redshift
  67. GRB 050603 - XRT data analysis of the first day
  68. Konus-Wind observation of GRB 050603
  69. GRB 050603: Analysis of UVOT data
  70. GRB 050603: Swift XRT Position
  71. GRB050603: Radio Detection
  72. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  73. GRB 050603: Afterglow Identification from LCO
  74. GRB 050603: INTEGRAL shows it is not a short GRB
  75. Swift/BAT Detection of GRB050603
  76. GRB 050408: jet break in the XRT light curve
  77. GRB 050525a, infrared observations
  78. GRB 050525a, SMARTS optical/IR afterglow observations
  79. GRB050528, XRT observations
  80. Correction to GCN Circ 3502 on GRB 050528
  81. GRB050528: updated Liverpool Telescope limits
  82. Swift-BAT GRB 050528: a soft burst
  83. Update on Swift-BAT GRB 050528 (Trigger 130679)
  84. GRB050528: BOOTES optical candidate (retraction)
  85. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  86. GRB050528: BOOTES optical candidate
  87. Possible GRB050528: no candidate from Liverpool Telescope
  88. Swift-BAT detection of possible GRB 050528
  89. GRB050525a: Radio Observations
  90. GRB 050509b: refined XRT/Chandra afterglow position analysis
  91. GRB 050525: RTT150, Optical observations
  92. GRB050525a: optical upper limits
  93. GRB 050525a: SARA Observations
  94. GRB 050525B: Swift-BAT observations
  95. GRB 050525: MITSuME Optical Observation in VRI
  96. GRB 050525a: MDM Observations
  97. GRB050525A,optical observation
  98. GRB 050525 : Lulin optical afterglow observations
  99. GRB050525: Super-LOTIS observations
  100. GRB 050525, spectral lag pseudo-redshift

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