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"

37912 results found.

  1. GRB050316: MASTER before, simultanious and follow up optical
  2. GRB 050306: ROTSE-III early limits
  3. GRB050316: MASTER optical observations
  4. GRB 050315: Swift-BAT further refined analysis
  5. GRB 050315, SMARTS optical/IR afterglow observations
  6. GRB 050315 I-band observations
  7. GRB050315: Radio afterglow
  8. GRB 050315: Absorption redshift
  9. GRB 050315: Optical afterglow identification
  10. GRB050315: Swift-BAT Refined analysis
  11. Non-detection of GRB050315 in ATCA Radio Observations
  12. GRB 050315: Swift XRT Position
  13. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  14. GRB 050315: Early Observations with Swift/UVOT
  15. Swift-BAT detection of GRB 050315
  16. GRB050223: No XMM-Newton OM detection of afterglow emission
  17. GRB 050306: Radio Observations
  18. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  19. GRB050309: CONCAM pre-trigger and trigger coincident optical
  20. GRB 050306: optical afterglow
  21. GRB 050126: Redshift determination
  22. Swift-BAT trigger 107873: No Swift XRT counterpart
  23. GRB 050306: Confirmation of X-ray afterglow
  24. GRB 050309, Early optical limits from RAPTOR
  25. GRB 050306: further TAROT optical data
  26. GRB050309: Early optical limit from P60
  27. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  28. GRB 050309 : Lulin R-band observation
  29. Swift 107873: P60 Optical Observations
  30. GRB 050306: CORRECTION to date of observation
  31. GRB 050306: R-band observations
  32. GRB 050306: No Swift UVOT Optical Counterpart Detected
  33. GRB 050306: REM optical-infrared observations
  34. GRB 050306: Possible X-ray Afterglow Position from the Swift
  35. Swift trigger 107518: optical observation
  36. GRB 050306: TAROT optical observations
  37. GRB 050306,optical observation
  38. GRB 050306: Swift-BAT detection of a long burst
  39. GRB050215B: Late-Time Swift UVOT Observations
  40. GRB 050126: Confirmation of the NIR afterglow candidate
  41. PROMPT VRcIc Observations of GRB 050223
  42. XRF/GRB 050215B: Radio Observations
  43. XMM-Newton Images of GRB 050223
  44. GRB 050219b: candidate NIR afterglow
  45. IBAS GRB Alert #2321
  46. GRB 050223: optical observations
  47. GRB050223 XMM-Newton observation
  48. INTEGRAL detection of GRB 050223
  49. GRB 050223 : Planned XMM-Newton observation
  50. GRB050223: No Swift UVOT Detection of Afterglow Emission
  51. GRB050223: ROTSE-III Optical Observations
  52. GRB 050223 Swift/BAT detection of a burst
  53. GRB 050223: Swift XRT Position
  54. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  55. GRB050219b: CORRECTION to time of UVOT observations
  56. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  57. GRB 050219b: CORRECTION to refined XRT position
  58. GRB 050219a: Optical observations from LCO
  59. GRB 050219b: Optical and near-IR observations from LCO
  60. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  61. GRB 050219b: Refined XRT position
  62. GRB 050219b: Swift-BAT detection of a burst
  63. GRB 050219b: CORRECTION: Swift XRT Position
  64. GRB 050219b: Swift XRT Position
  65. GRB 050219a, optical observations
  66. GRB 050219a: Refined XRT position
  67. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  68. GRB 050219: Swift-BAT detection of a burst
  69. GRB050215b: Swift UVOT Detection of Afterglow Emission
  70. GRB 050219: Prompt X-ray position
  71. GRB 050215B: Radio Observations
  72. GRB 050215b: XRT confirmation of IR afterglow candidate
  73. GRB050215b: P60 Optical Observations
  74. GRB 050215b: Swift XRT Source Variability
  75. GRB 050215B: candidate afterglow
  76. GRB 050215b : Lulin follow-up observation
  77. GRB 050215b, BOOTES-2 simultaneous optical observations
  78. GRB 050215B: UKIRT K-band imaging
  79. GRB 050215b: Swift XRT Observations
  80. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  81. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  82. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  83. GRB 050215b, BOOTES-1B optical limit
  84. GRB050215B: ROTSE-III optical observations
  85. GRB050215A: ROTSE-III Optical Observations
  86. GRB050209: TAROT optical observations
  87. GRB 050209(=U11568): Duration and spectrum
  88. short/hard GRB 050202, optical observations
  89. GRB050209: REM optical observations
  90. GRB 050209 I-band observation
  91. GRB 050209 Optical observations
  92. GRB050209: P60 Optical Observations
  93. GRB050209 (=U11568): A Long GRB Detected by HETE
  94. GRB 050209: Optical observation
  95. GRB 050128: Radio observations
  96. Further analysis of the short Swift-BAT GRB 050202
  97. GRB 050202: Second epoch radio observations
  98. GRB 050129: Optical observations
  99. GRB050202: Radio Observations
  100. GRB 050202: Optical observations with LCO40

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