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"

24475 results found.

  1. GRB 120514A: Swift-XRT refined Analysis
  2. GRB 120514A: APEX observations of the submm counterpart
  3. GRB 120514A: Swift-BAT refined analysis
  4. Fermi GBM Trigger 358364818 is not a GRB
  5. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  6. GRB 120510A: MASTER follow up observations
  7. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  8. GRB 120422A: P200 NIR detection
  9. GRB 120422A: CARMA 3mm observations
  10. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  11. GRB 120422A: Gemini-N detection of a supernova
  12. GRB 120427A: MASTER follow up observations
  13. Konus-Wind observation of GRB 120427A
  14. IPN Triangulation of GRB 120427A
  15. Konus-Wind observation of GRB 120426A
  16. IPN Triangulation of bright GRB 120426A
  17. GRB 120422A: MITSuME Ishigakijima upper limit
  18. Swift Trigger 520928 is probably not a burst
  19. GRB 120424A: MAXI/GSC detection of a burst
  20. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  21. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  22. GRB 120422A: Xinglong TNT optical upper limit
  23. GRB 120422A: Swift-BAT refined analysis
  24. GRB 120422A: Faulkes Telescope North observations
  25. GRB 120422A: Swift detection of a burst
  26. GRB 120419A: A long GRB detected by INTEGRAL
  27. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  28. Swift Trigger 519874 is probably a noise event
  29. GRB 120404A, Optical Observations
  30. GRB 120404A: SMARTS optical/IR observations
  31. GRB 120404A: MASTER OT observations
  32. GRB120404A: GROND observations show steeply decaying afterglow
  33. GRB 120404A: VLT/X-shooter redshift confirmation
  34. GRB 120404A: MITSuME Ishigakijima Optical Observation
  35. GRB 120404A: MITSuME Okayama Optical Observation
  36. GRB 120404A : TNT optical observation
  37. GRB 120404A: Swift-BAT refined analysis
  38. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  39. GRB 120402B: MASTER early OT limit
  40. GRB 120403B: Fermi GBM Observation
  41. GRB 120404A: MITSuME Akeno Optical upper limits
  42. GRB 120404A: MASTER early OT limit
  43. GRB 120404A: Faulkes Telescope North afterglow confirmation
  44. GRB 120404A: Swift detection of a burst with an optical counterpart
  45. GRB 120403B: Swift-BAT refined analysis
  46. GRB 120403B: Swift detection of a burst
  47. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  48. GRB 120403A: MASTER follow up observations
  49. GRB 120402A: MASTER follow up observations
  50. GRB 120403A, Swift-BAT refined analysis
  51. GRB 120402B: Fermi GBM detection
  52. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  53. GRB 120403A: Swift detection of a burst
  54. GRB 120402A: Swift detection of a possible burst or noise
  55. GRB 120327A: SMARTS optical/IR afterglow observations
  56. GRB 120401A: Swift-XRT refined Analysis
  57. GRB 120401A: Swift-BAT refined analysis
  58. GRB 120326A: HCT optical observations
  59. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  60. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  61. GRB 120326A : Suzaku WAM observation of the prompt emission
  62. GRB 120326A: CARMA 3mm detection
  63. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  64. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  65. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  66. Swift trigger 518853: MASTER-ICATE possible OT
  67. GRB 120328B: Fermi-LAT Observations
  68. GRB 120328B: Fermi GBM detection
  69. long/intense GRB 120328B: MASTER follow up observations
  70. GRB 120328A: Swift-XRT refined Analysis
  71. Konus-Wind observation of GRB 120328B
  72. IPN Triangulation of GRB 120328B (long/intense)
  73. GRB 120327A: MITSuME Ishigakijima Optical Observation
  74. GRB 120326A: MITSuME Ishigakijima Optical Observation
  75. GRB 120328A: Swift-BAT refined analysis
  76. GRB 120327A: NOT optical observations
  77. GRB 120326A: Xinglong TNT further optical observation��correction for GCN Cir 13149)
  78. GRB 120326A: Xinglong TNT further optical observation
  79. Skynet/PROMPT observations of GRB120328A
  80. GRB 120326A: Fermi GBM Observation
  81. GRB 120326A: PAIRITEL NIR Observations
  82. GRB 120326A: LOAO R-band Observations
  83. GRB 120327A: Swift-BAT refined analysis
  84. GRB 120327A: X-shooter redshift
  85. GRB 120327A: IAC80 I-band observations
  86. GRB 120327A: REM NIR and optical observations
  87. GRB 120327A: Liverpool Telescope Observations
  88. GRB 120326A: optical observation of GMG
  89. GRB 120326A: Swift-BAT refined analysis
  90. GRB 120326A: T17 optical observations
  91. GRB 120326A: CQUEAN grizY Observation
  92. GRB 120323A: MASTER follow up observations
  93. GRB 120326A: Swift-XRT refined Analysis
  94. GRB 120326A: Swift/UVOT Detection
  95. GRB 120326A: Optical observations at Crni Vrh
  96. GRB 120326A: Liverpool Telescope observations
  97. Skynet/Dolomiti Observations of GRB120326A
  98. GRB 120326A: ROTSE-III Optical Limits
  99. GRB 120323A: Fermi LAT observations
  100. Konus-Wind observation of GRB 120323A

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