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"

19663 results found.

  1. GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission
  2. GRB070125: Swift-XRT Refined Analysis
  3. GRB 070126?: Swift detection of a possible burst
  4. IPN-BAT localization of GRB070125 (very long duration, intense)
  5. IPN localization of GRB070124 (short duration, hard spectrum)
  6. Swift-BAT trigger 257213 is a Galactic Center transient
  7. GRB 070110: Continued Detection and Request for Ground Followup
  8. GRB 070110: Ep,i - Eiso correlation
  9. GRB 070110 declared a "Burst of Interest" by Swift team
  10. Further Retractions of previous Swift-BAT triggers
  11. Swift-BAT Trigger 255685 is not a GRB
  12. Trigger 255685: Swift detection of a possible burst
  13. GRB 070110: UVOT Observations of a Candidate Afterglow
  14. GRB070110: Swift XRT Team refined analysis
  15. GRB 070110, Swift-BAT refined analysis
  16. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  17. GRB 070110: Swift detection of a burst with a possible optical afterglow
  18. GRB070107: Swift/XRT refined analysis
  19. GRB 070107: Possible UVOT Afterglow
  20. GRB 070107, Swift-BAT refined analysis
  21. GRB 070107: Swift/XRT position
  22. GRB 070107: Swift detection of a burst
  23. GRB070103: APO SPIcam i' and z' limits
  24. GRB 070103: Swift/UVOT Upper limits
  25. GRB070103: Swift XRT refined analysis
  26. GRB 070103, Swift-BAT refined analysis
  27. GRB 070103: TAROT Calern observatory optical observations
  28. GRB 070103: Swift detection of a burst
  29. Retractions of previous Swift-BAT triggers
  30. Konus-Wind observation of GRB 061222A
  31. GRB 061210: Swift/XRT Astrometry Correction
  32. GRB 050826: MDM Redshift
  33. GRB 061222B, Swift-BAT refined analysis
  34. GRB061222A Swift/UVOT: Upper Limits
  35. GRB 061222B: Swift/UVOT Upper limits
  36. GRB061222B: Swift-XRT Refined Analysis
  37. GRB 061222B: BOOTES-IR optical observations
  38. GRB 061222B: SARA upper limit
  39. GRB 061222A: Swift-XRT refined analysis
  40. GRB 061222A, Swift-BAT refined analysis
  41. GRB 061222B: TAROT La Silla observatory optical observations
  42. GRB 061222B: Swift detection of a burst
  43. GRB 061222A: Prompt ROTSE-III Optical Limits
  44. GRB 061222: Swift detection of a burst
  45. GRB 061217: Astrometry-Corrected XRT Position
  46. GRB 061217, Candidate host galaxy
  47. GRB 061217 - Swift/XRT position correction
  48. GRB 061218: TAROT La Silla observatory optical observations
  49. GRB 061217: TAROT Calern observatory optical observations
  50. GRB 061218, Swift-BAT refined analysis
  51. Swift triggers (#251863) on a possible burst
  52. GRB061217: Swift/UVOT refined analysis.
  53. GRB 061217: optical observations at Calar Alto
  54. GRB061217 - Swift/XRT refined analysis
  55. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  56. GRB 061217, Swift-BAT refined analysis
  57. GRB 061217: ROTSE-III Optical Limits
  58. GRB 061217: Swift detection of a short hard burst
  59. GRB 061210: MDM Follow-up Observation
  60. GRB061210: Swift/UVOT observations
  61. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  62. GRB 061210: Swift XRT analysis - Possible counterparts
  63. GRB 061210 : Faulkes North Telescope optical limit
  64. GRB 061214(?): ROTSE-III Optical Limits
  65. GRB 061214(?): Swift detection of a possible burst
  66. Swift/BAT trigger #250033 is due to a known source during loss of
  67. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  68. GRB 061213: MASTER-VWF-Kislovodsk observations
  69. GRB 061210: MDM Observation
  70. GRB 061210, Swift-BAT refined analysis of the SHB
  71. GRB 061210: Swift-BAT detection of a short burst
  72. Optical Afterglow observations of GRB 061126
  73. GRB061126: update on the Swift-XRT afterglow light curve
  74. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  75. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  76. GRB061126 : NMSU 1.0m observations
  77. GRB 061202: Swift XRT refined analysis
  78. GRB061202: FRAM early follow-up limit
  79. GRB061202 optical limit by "Pi of the Sky"
  80. Konus-Wind observation of GRB 061201
  81. GRB061202: Swift/UVOT Upper Limits
  82. GRB 061202, Swift-BAT refined analysis
  83. GRB 061202: Swift detection of a burst
  84. GRB 061201: Swift XRT Team refined analysis
  85. GRB 061201: Initial UVOT Observations
  86. GRB 061201, Swift-BAT refined analysis of the SHB
  87. GRB 061201: Swift detection of a short hard burst
  88. GRB 061201: Coincidence with a Galaxy Cluster
  89. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  90. Swift XRT on-board boresight update
  91. GRB 061126: Early Super-LOTIS Observations
  92. GRB061126: Optical afterglow observations from MIRO
  93. GRB061126: Optical afterglow observations from MIRO
  94. GRB 061126: Swift-XRT refined analysis
  95. GRB 061126: Swift/UVOT Observations
  96. GRB 061126, Swift-BAT refined analysis
  97. GRB 061126: Faulkes Telescope North Optical Observations
  98. GRB 061126: Swift/UVOT Afterglow Detection
  99. GRB 061126: XRT position
  100. GRB 061126: Swift detection of a burst

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