Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35995 results found.

  1. GRB 070125 detection with CARMA
  2. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  3. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  4. GRB 070129: afterglow confirmation
  5. GRB070124: Swift-XRT Follow-up Observation
  6. GRB070126: Swift-XRT Observation
  7. GRB 070125: further AAVSO optical observations
  8. GRB 070129: Swift/UVOT Upper limits
  9. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  10. GRB 070125: optical observation
  11. GRB 070125: WSRT Radio Detection
  12. Radio detection of GRB 070125
  13. GRB061217: MAGIC telescope GeV observation
  14. GRB 070125: confirmation of pseudo-redshift
  15. GRB 070129, Swift-BAT refined analysis of a particularly long
  16. GRB 070129: Xinglong TNT optical Upper Limit
  17. GRB 070129: Swift-XRT Refined Analysis
  18. GRB 070129: VLT observations
  19. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  20. GRB 070129: Swift detection of a burst
  21. GRB 070126: Swift/UVOT refined analysis
  22. GRB 070125: further AAVSO optical observations
  23. GRB 070125: MITSuME Okayama optical observation
  24. Konus-Wind observation of GRB 070125
  25. GRB 070125: AAVSO optical observations
  26. GRB 070125: optical observations
  27. GRB 070126: VLT observations
  28. GRB070126: Swift-XRT possible detection of an afterglow
  29. GRB 070125: PROMPT detections
  30. GRB 070124: Suzaku WAM observation of the prompt emissions
  31. GRB 070125: WSRT Radio Observations
  32. GRB 070125: UVOT Detection in Ultraviolet Filters
  33. GRB 070126, Swift-BAT refined analysis of a very faint burst
  34. GRB070125: Optical observation by Kanata
  35. Possible GRB 070126: Swift/UVOT Upper Limit
  36. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  37. GRB 070125: Xinglong TNT optical observations
  38. GRB 070125: Continued P60 Observations
  39. GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission
  40. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  41. GRB 070125: Lick 3m Spectroscopy
  42. GRB070125: Swift-XRT Refined Analysis
  43. GRB 070125: SARA detection in R
  44. GRB 070125: P60 Optical Afterglow Candidate
  45. GRB 070126?: Swift detection of a possible burst
  46. GRB070125 redshift request
  47. RHESSI Spectrum of GRB070125
  48. IPN-BAT localization of GRB070125 (very long duration, intense)
  49. Konus-Wind observation of short hard GRB 070124
  50. IPN localization of GRB070124 (short duration, hard spectrum)
  51. GRB 070110: optical break
  52. GRB 070110: Continued Detection and Request for Ground Followup
  53. GRB 050904: Second Epoch of HST/NICMOS Observations
  54. GRB 070110: Ep,i - Eiso correlation
  55. GRB 070107: Suzaku WAM observation of the prompt emission
  56. GRB 070110: VLT R-band photometry
  57. GRB 070110 declared a "Burst of Interest" by Swift team
  58. Further Retractions of previous Swift-BAT triggers
  59. Swift-BAT Trigger 255685 is not a GRB
  60. Trigger 255685: Swift detection of a possible burst
  61. GRB 070110: VLT absorption redshift
  62. GRB 070110: UVOT Observations of a Candidate Afterglow
  63. GRB 070110, Swift-BAT refined analysis
  64. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  65. GRB 070110: Swift detection of a burst with a possible optical afterglow
  66. IBAS Alert n. 4047: Not a GRB
  67. GRB070107: Swift/XRT refined analysis
  68. GRB 070107: Possible UVOT Afterglow
  69. GRB 070107, Swift-BAT refined analysis
  70. GRB 070107: Swift/XRT position
  71. GRB 070107: Swift detection of a burst
  72. VLA observation of GRB 061222B
  73. VLA detection of GRB 061222A
  74. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  75. GRB070103: KPNO 4m+FLAMINGOS J limit
  76. GRB 070103: Swift/UVOT Upper limits
  77. GRB 070103, Swift-BAT refined analysis
  78. GRB 070103: NOT observations
  79. GRB 070103: TAROT Calern observatory optical observations
  80. GRB 070103: Swift detection of a burst
  81. Retractions of previous Swift-BAT triggers
  82. GRB061222a: optical observations
  83. erratum : SDSS Pre-burst Observations of GRB061126
  84. Konus-Wind observation of GRB 061222A
  85. GRB 061210: Swift/XRT Astrometry Correction
  86. GRB 050826: MDM Redshift
  87. GRB 061222B: TAROT La Silla observatory early optical observations
  88. GRB 061218: TAROT La Silla observatory early optical observations
  89. GRB 061222A: MITSuME Akeno optical upper limits
  90. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  91. GRB 061222B: MITSuME Akeno optical upper limits
  92. GRB 061222A: Xinglong Optical Limit
  93. GRB 061222A: Gemini Afterglow Candidate
  94. GRB 061222B, Swift-BAT refined analysis
  95. GRB061222A Swift/UVOT: Upper Limits
  96. GRB 061222B: Swift/UVOT Upper limits
  97. GRB 061222B: Observation with the KANATA 1.5m telescope
  98. GRB061222B: Swift-XRT Refined Analysis
  99. GRB 061222A: Observation with the KANATA 1.5m telescope
  100. GRB 061222B: BOOTES-IR optical 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