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"

32689 results found.

  1. GRB050315: Swift-BAT Refined analysis
  2. Non-detection of GRB050315 in ATCA Radio Observations
  3. GRB 050315: Swift XRT Position
  4. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  5. GRB 050315: Early Observations with Swift/UVOT
  6. GRB050223: No XMM-Newton OM detection of afterglow emission
  7. GRB 050306: Radio Observations
  8. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  9. GRB 050306: optical afterglow
  10. Swift-BAT trigger 107873: No Swift XRT counterpart
  11. GRB 050306: Confirmation of X-ray afterglow
  12. GRB 050309, Early optical limits from RAPTOR
  13. GRB050309: Early optical limit from P60
  14. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  15. GRB 050306: CORRECTION to date of observation
  16. GRB 050306: R-band observations
  17. GRB 050306: No Swift UVOT Optical Counterpart Detected
  18. GRB 050306: REM optical-infrared observations
  19. GRB 050306: Possible X-ray Afterglow Position from the Swift
  20. GRB 050306,optical observation
  21. GRB050215B: Late-Time Swift UVOT Observations
  22. PROMPT VRcIc Observations of GRB 050223
  23. XRF/GRB 050215B: Radio Observations
  24. GRB 050219b: candidate NIR afterglow
  25. GRB 050223: optical observations
  26. GRB050223 XMM-Newton observation
  27. INTEGRAL detection of GRB 050223
  28. GRB050223: No Swift UVOT Detection of Afterglow Emission
  29. GRB050223: ROTSE-III Optical Observations
  30. GRB050219b: CORRECTION to time of UVOT observations
  31. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  32. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  33. GRB 050219b: CORRECTION to refined XRT position
  34. GRB 050219a: Optical observations from LCO
  35. GRB 050219b: Optical and near-IR observations from LCO
  36. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  37. GRB 050219b: CORRECTION: Swift XRT Position
  38. GRB 050219a, optical observations
  39. GRB 050219a: Refined XRT position
  40. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  41. GRB 050219: Swift-BAT detection of a burst
  42. GRB050215b: Swift UVOT Detection of Afterglow Emission
  43. GRB 050215B: Radio Observations
  44. GRB 050215b: XRT confirmation of IR afterglow candidate
  45. GRB050215b: P60 Optical Observations
  46. GRB 050215b: Swift XRT Source Variability
  47. GRB 050215B: candidate afterglow
  48. GRB 050215b : Lulin follow-up observation
  49. GRB 050215b, BOOTES-2 simultaneous optical observations
  50. GRB 050215B: UKIRT K-band imaging
  51. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  52. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  53. GRB 050215b, BOOTES-1B optical limit
  54. GRB050215A: ROTSE-III Optical Observations
  55. GRB050209: TAROT optical observations
  56. short/hard GRB 050202, optical observations
  57. GRB050209: REM optical observations
  58. GRB 050209 I-band observation
  59. GRB050209: P60 Optical Observations
  60. GRB050209 (=U11568): A Long GRB Detected by HETE
  61. GRB 050128: Radio observations
  62. Further analysis of the short Swift-BAT GRB 050202
  63. GRB 050202: Second epoch radio observations
  64. GRB 050129: Optical observations
  65. GRB050202: Radio Observations
  66. GRB 050202: Optical observations with LCO40
  67. GRB 050128 Optical observation with REM
  68. GRB050128: Faulkes Telescope South observations
  69. GRB 050124: Radio Observations
  70. GRB 050128: near-infrared observations with REM
  71. GRB050128,optical observations
  72. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  73. GRB 050126: Radio Observations
  74. GRB050128 Swift-BAT observations
  75. GRB 050128: Swift XRT prompt afterglow position
  76. GRB 050124: K-band afterglow observations
  77. GRB050126: MASTER optical limit for KECK OT
  78. GRB050126: Burst Parameters Measured by BAT
  79. GRB050126: MASTER optical observations
  80. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  81. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  82. GRB050124: No Swift UVOT Detection of Afterglow Emission
  83. GRB 050124, SMARTS optical/IR observations
  84. GRB 050117a: Radio Observations
  85. GRB 050124 I-band observation
  86. GRB 050124: NIR Candidates from Keck/NIRC
  87. GRB050124,optical observation
  88. GRB 050124 : Lulin R-band follow-up observation
  89. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  90. GRB050124: Refined BAT position, spectral and fluence information
  91. GRB 050123 : I-band follow-up observation
  92. GRB050123: optical limit 1.8h before GRB
  93. GRB 050123: KAIT observations
  94. GRB050123: P60 Observations
  95. CFHTLS optical transient unlikely to be a GRB
  96. GRB050117a: Radio Observations
  97. GRB050117a: Refined analysis
  98. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  99. GRB050117: Palomar WIRC Ks-band observations
  100. GRB050117: optical observation

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