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"

19701 results found.

  1. Skynet/PROMPT observations of GRB120327A
  2. GRB 120327A: TAROT La Silla observatory optical detection
  3. GRB 120327A: Swift detection of a burst with an optical counterpart
  4. GRB 120326A : LOT optical observation
  5. GRB 120326A: Swift/UVOT Detection
  6. GRB 120326A: Enhanced Swift-XRT position
  7. GRB 120326A: TAROT Calern observatory afterglow optical detection
  8. GRB 120326A: Swift detection of a burst
  9. Konus-Wind observation of GRB 120323A
  10. IPN Triangulation of GRB 120323A (short/very intense)
  11. GRB 120324A: GROND observations
  12. GRB 120324A: CQUEAN rizY Observation
  13. GRB 120324A: Swift/UVOT Upper Limits
  14. GRB 120324A: TAROT La Silla observatory optical observations
  15. GRB 120324A: Enhanced Swift-XRT position
  16. GRB 120324A: UVOT Finding Chart Observation
  17. GRB 120324A: Swift detection of a burst
  18. GRB 120320A: Zadko optical observations
  19. GRB 120229A: Magellan observations and limit on an optical afterglow
  20. GRB 120320A: Swift/UVOT Upper Limits
  21. GRB 120320A: MITSuME Okayama Optical upper limits
  22. GRB 120320A , optical observations
  23. GRB 120320A: BOOTES-4 optical upper limit
  24. GRB 120320A: Swift-XRT refined Analysis
  25. GRB 120320A: Gemini-N and UKIRT observations
  26. GRB 120320A: Enhanced Swift-XRT position
  27. Konus-Wind observation of GRB 120316A
  28. IPN Triangulation of GRB 120316A
  29. GRB 120320A: MASTER optical observations
  30. GRB 120320A: Swift detection of a burst
  31. GBM trigger 353549464 (GRB 120316A?) : High-energy photon emission in Fermi/LAT data
  32. GRB 120302A: Swift XRT refined analysis
  33. GRB 120312A: CrAO optical upper limit
  34. GRB 120312A: Gemini and UKIRT imaging
  35. GRB 120311A: Optical follow-up
  36. GRB 120311B: Optical follow-up
  37. GRB 120311A: C88 optical limits
  38. GRB 120312A: Swift/UVOT Upper Limits
  39. GRB 120312A: WHT candidate afterglow
  40. GRB 120312A: NOT observations
  41. GRB 120312A: Swift-XRT refined Analysis
  42. GRB 120311B: C88 optical limits
  43. GRB 120312A: Swift detection of a burst
  44. GROND observations of GRB 120311A
  45. GRB 120311B: Swift/UVOT Upper Limits
  46. GRB 120311B: MITSuME Okayama Optical upper limits
  47. GRB 120311B: Faulkes Telescope North observations
  48. GRB 120311B: Enhanced Swift-XRT position
  49. GRB 120311B: Swift-XRT observations
  50. GRB 120311A: Swift/UVOT Upper Limits
  51. GRB 120311A: Enhanced Swift-XRT position
  52. GRB 120311A: Swift-XRT observations
  53. GRB 120308A: RTT150 optical observations
  54. GRB 120302A: RTT150 optical observations
  55. GRB 120308A: 1.23m CAHA I-band observations
  56. GRB 120308A: Further PAIRITEL NIR Observations
  57. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  58. GRB 120308A: Swift/UVOT Detection
  59. GRB 120308A: Enhanced Swift-XRT position
  60. GRB 120308A: IAC80 I-band observations
  61. GRB 120308A: PAIRITEL NIR observations
  62. GRB 120308A: confirmation of the optical afterglow
  63. GRB 120308A: Swift detection of a burst
  64. GRB 120305A: D50 optical limits
  65. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  66. GRB 120305A: Swift/UVOT Upper Limits
  67. GRB 120305A: Enhanced Swift-XRT position
  68. GRB 120305A: Swift detection of a short burst
  69. GRB 120302A: GROND detection of an afterglow candidate
  70. GRB 111222A: Swift observation on 2012 February 06/07
  71. GRB 120229A: Spectral lag analysis
  72. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  73. IPN Triangulation of GRB 120226A
  74. GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
  75. GRB 120224A: optical observation in Mondy observatory
  76. GRB 120224A: GROND detection of the afterglow candidate
  77. Swift Trigger 516027 is CC Eri
  78. GRB 120224A: Swift/UVOT Upper Limits
  79. GRB 120224A: Enhanced Swift-XRT position
  80. GRB 120224A: Swift detection of a burst
  81. GRB 1202019A: optical observation in Mondy observatory
  82. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  83. GRB 120219A: 1.23m CAHA optical observations
  84. GRB 120219A: Swift/UVOT Upper Limits
  85. GRB 120219A: MITSuME Okayama Optical upper limits
  86. GRB 120219A: Enhanced Swift-XRT position
  87. GRB 120219A: MASTER-NET prompt and early optical observations
  88. GRB 120219A: Swift detection of a burst
  89. GRB 120215A: Swift/UVOT Upper Limits
  90. GRB 120215A: MITSuME Okayama Optical upper limits
  91. GRB 120215A: Enhanced Swift-XRT position
  92. Skynet/PROMPT observations of GRB120215A
  93. GRB 120215A: Swift detection of a burst
  94. GRB 120213A: Swift/UVOT Upper Limits
  95. GRB 120212A: GMG optical observation
  96. GRB 120213A: Enhanced Swift-XRT position
  97. GRB 120212A: MITSuME Ishigakijima Optical Observation
  98. GRB 120213A: Swift detection of a burst
  99. GRB 120212A: NOT optical observation
  100. GRB 120212A: Swift/UVOT Detection

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