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"

26691 results found.

  1. GRB 120807A: Swift-XRT refined Analysis
  2. GRB 120802A: optical observations
  3. GRB 120807A: Fermi/LAT upper limit
  4. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  5. GRB 120807A: TAROT La Silla observatory optical observations
  6. GRB 120807A: Swift-BAT refined analysis
  7. GRB 120807A: Enhanced Swift-XRT position
  8. GRB 120807A: Swift detection of a burst
  9. Fermi/GBM detection of an SGR-like burst
  10. GRB 120805A: Swift/UVOT Upper Limits
  11. Swift trigger 530214: uncertain if real or not
  12. GRB 120728A: Fermi GBM observation
  13. GRB 120802A: Swift/UVOT Upper Limits
  14. GRB 120805A: Swift-XRT refined Analysis
  15. GRB 120805A: TAROT Calern observatory optical observations
  16. GRB 120805A: Swift detection of a burst
  17. GRB 120804A: MITSuME Okayama Optical upper limits
  18. GRB 120803B: Swift-XRT refined Analysis
  19. GRB 120804A: Swift/UVOT Upper Limits
  20. GRB 120804A: Swift-XRT refined Analysis
  21. GRB 120804A: GROND upper limits
  22. GRB 120804A: Enhanced Swift-XRT position
  23. GRB 120803B: MITSuME Okayama Optical upper limits
  24. GRB 120803A: MITSuME Okayama Optical upper limits
  25. GRB 120804A: Swift detection of a short burst
  26. GRB 120803B: Enhanced Swift-XRT position
  27. GRB 120803A: Swift-XRT Observations
  28. GRB 120803B: FTN possible afterglow candidate
  29. GRB 120803B: Swift detection of a burst
  30. GRB 120803A: Swift detection of a possible burst
  31. GRB 120802A: GRT Optical Observation
  32. GRB 120802A: Swift-XRT refined Analysis
  33. GRB 120802A Gemini-N redshift
  34. GRB 120802A: APEX/LABOCA submm observations
  35. GRB 120729A: Fermi GBM observation
  36. GRB 120802A: Swift-BAT refined analysis
  37. GRB 120802A: Enhanced Swift-XRT position
  38. GRB 120802A: MASTER optical observations
  39. GRB 120802A: optical uper limit in ISON-NM observatory
  40. GRB 120802A: Swift detection of a burst
  41. GRB 120729A: JCMT SCUBA-2 sub-mm observation
  42. GRB 120728B: Fermi GBM detection
  43. Konus-Wind observation of GRB 120728B
  44. GRB 120729A: break in the optical light curve
  45. GRB 120729A: Optical observations from OSN, BOOTES1/2 and IAC80
  46. GRB 120729A: RTT150 optical observations
  47. Virtual Telescope observations of GRB 120729A
  48. T100 observations of GRB 120729A
  49. GRB 120728A: GROND Afterglow discovery
  50. GRB 120729A: Swift-XRT refined Analysis
  51. GRB 120729A: Swift/UVOT Detection
  52. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
  53. GRB 120729A: Enhanced Swift-XRT position
  54. GRB 120728A: Swift/UVOT Upper Limits
  55. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  56. GRB 120729A: Swift detection of a burst with an optical afterglow
  57. GRB 120728A: Swift-XRT refined Analysis
  58. GRB 120728A: Enhanced Swift-XRT position
  59. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  60. GRB 120728A: GROND observations
  61. GRB 120728A: Swift detection of a burst
  62. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  63. Swift Trigger 528925 is probably a noise fluctuation
  64. GRB 120722A: optical upper limit
  65. GRB 120724A: optical observation in Maidanak observatory
  66. GRB 120724A: JCMT SCUBA-2 sub-mm observation
  67. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  68. GRB 120724A: Enhanced Swift-XRT position
  69. GRB 120724A: Swift-XRT refined Analysis
  70. GRB 120724A: Gemini-N tentative redshift
  71. GRB 120724A: FTN optical afterglow candidate
  72. GRB 120724A: Swift detection of a burst
  73. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  74. GRB 120722A: Swift/UVOT Upper Limits
  75. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  76. GRB 120722A: GROND detection of the afterglow
  77. GRB 120722A: 1.5m OSN I-band observations
  78. GRB 120722A: Swift-XRT refined Analysis
  79. GRB 120722A: Enhanced Swift-XRT position
  80. GRB 120722A: Swift detection of a burst
  81. GRB 120716A: Fermi GBM observation
  82. GRB 120716A: Swift-XRT detection
  83. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  84. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  85. GRB 120716A: Optical decay from NOT
  86. GRB 120716A: Candidate Optical Afterglow from PTF
  87. GRB 120714B: Swift/UVOT Detection
  88. GRB 120714B: Swift-XRT refined Analysis
  89. GRB120714A: Swift/UVOT upper limits
  90. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  91. GRB 120714A: GROND upper limits
  92. GRB 120714B: GROND confirmation of fading afterglow
  93. GRB 120714B: Redshift from VLT/X-shooter
  94. GRB 120714A: Swift-XRT refined Analysis
  95. GRB 120624B: VLA Observations
  96. GRB 120714B: Swift detection of a burst
  97. GRB 120714A: Enhanced Swift-XRT position
  98. GRB 120712A: Fermi GBM observation
  99. GRB 120711A: INTEGRAL/SPI observations
  100. GRB 120714A: Swift-XRT observations

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