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"

24509 results found.

  1. GRB 120602A: Suzaku WAM observation of the prompt emission
  2. Konus-Wind observation of GRB 120617A
  3. IPN Triangulation of GRB 120617A (short/intense)
  4. Swift Trigger 524642 is Swift J1910.2-0546
  5. Konus-Wind observation of GRB 120602A
  6. IPN Triangulation of GRB 120602A (long/very bright)
  7. GRB 120612A: optical observations
  8. GRB 120612A: Swift-BAT refined analysis
  9. GRB 120603A: Suzaku WAM observation of the prompt emission
  10. Konus-Wind observation of GRB 120603A
  11. IPN Triangulation of short GRB 120603A
  12. Konus-Wind observation of GRB 120528B
  13. GRB 120519A: Suzaku WAM observation of the prompt emission
  14. GRB 120512A: Suzaku WAM observation of the prompt emission
  15. GRB 120521C: EVLA Localization of Afterglow
  16. Konus-Wind observation of GRB 120522A
  17. IPN triangulation of GRB 120522A (long/intense)
  18. GRB 120521B: Fermi GBM observation
  19. GRB 120521C: Early Tautenburg limits
  20. GRB 120521C: Swift-BAT refined analysis
  21. GRB 120521C: MASTER optical limit
  22. GRB 120521B: GROND Upper limits
  23. GRB 120521C: PAIRITEL NIR Upper Limits
  24. GRB 120521C: Swift detection of a burst
  25. GRB 120521B: Swift-BAT refined analysis
  26. Konus-Wind observation of GRB 120519A
  27. Swift starts a new program to find fainter transients
  28. IPN Triangulation of GRB 120519A (short/hard)
  29. GRB 120521A: Swift-BAT refined analysis
  30. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  31. GRB120521B: Faulkes Telescope South observations
  32. GRB 120514A : Suzaku WAM observation of the prompt emission
  33. GRB 120512A: A long GRB detected by INTEGRAL
  34. Konus-Wind observation of GRB 120510A
  35. GRB 120514A: Swift-XRT refined Analysis
  36. GRB 120514A: APEX observations of the submm counterpart
  37. GRB 120514A: Swift-BAT refined analysis
  38. Fermi GBM Trigger 358364818 is not a GRB
  39. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  40. GRB 120510A: MASTER follow up observations
  41. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  42. GRB 120422A: P200 NIR detection
  43. GRB 120422A: CARMA 3mm observations
  44. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  45. GRB 120422A: Gemini-N detection of a supernova
  46. GRB 120427A: MASTER follow up observations
  47. Konus-Wind observation of GRB 120427A
  48. IPN Triangulation of GRB 120427A
  49. Konus-Wind observation of GRB 120426A
  50. IPN Triangulation of bright GRB 120426A
  51. GRB 120422A: MITSuME Ishigakijima upper limit
  52. Swift Trigger 520928 is probably not a burst
  53. GRB 120424A: MAXI/GSC detection of a burst
  54. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  55. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  56. GRB 120422A: Xinglong TNT optical upper limit
  57. GRB 120422A: Swift-BAT refined analysis
  58. GRB 120422A: Faulkes Telescope North observations
  59. GRB 120422A: Swift detection of a burst
  60. GRB 120419A: A long GRB detected by INTEGRAL
  61. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  62. Swift Trigger 519874 is probably a noise event
  63. GRB 120404A, Optical Observations
  64. GRB 120404A: SMARTS optical/IR observations
  65. GRB 120404A: MASTER OT observations
  66. GRB120404A: GROND observations show steeply decaying afterglow
  67. GRB 120404A: VLT/X-shooter redshift confirmation
  68. GRB 120404A: MITSuME Ishigakijima Optical Observation
  69. GRB 120404A: MITSuME Okayama Optical Observation
  70. GRB 120404A : TNT optical observation
  71. GRB 120404A: Swift-BAT refined analysis
  72. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  73. GRB 120402B: MASTER early OT limit
  74. GRB 120403B: Fermi GBM Observation
  75. GRB 120404A: MITSuME Akeno Optical upper limits
  76. GRB 120404A: MASTER early OT limit
  77. GRB 120404A: Faulkes Telescope North afterglow confirmation
  78. GRB 120404A: Swift detection of a burst with an optical counterpart
  79. GRB 120403B: Swift-BAT refined analysis
  80. GRB 120403B: Swift detection of a burst
  81. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  82. GRB 120403A: MASTER follow up observations
  83. GRB 120402A: MASTER follow up observations
  84. GRB 120403A, Swift-BAT refined analysis
  85. GRB 120402B: Fermi GBM detection
  86. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  87. GRB 120403A: Swift detection of a burst
  88. GRB 120402A: Swift detection of a possible burst or noise
  89. GRB 120327A: SMARTS optical/IR afterglow observations
  90. GRB 120401A: Swift-XRT refined Analysis
  91. GRB 120401A: Swift-BAT refined analysis
  92. GRB 120326A: HCT optical observations
  93. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  94. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  95. GRB 120326A : Suzaku WAM observation of the prompt emission
  96. GRB 120326A: CARMA 3mm detection
  97. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  98. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  99. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  100. Swift trigger 518853: MASTER-ICATE possible OT

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