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"

32552 results found.

  1. GRB 070126: Swift/UVOT refined analysis
  2. GRB 070125: further AAVSO optical observations
  3. GRB 070125: MITSuME Okayama optical observation
  4. Konus-Wind observation of GRB 070125
  5. GRB 070125: AAVSO optical observations
  6. GRB 070125: optical observations
  7. GRB 070126: VLT observations
  8. GRB070126: Swift-XRT possible detection of an afterglow
  9. GRB 070125: PROMPT detections
  10. GRB 070124: Suzaku WAM observation of the prompt emissions
  11. GRB 070125: WSRT Radio Observations
  12. GRB 070125: UVOT Detection in Ultraviolet Filters
  13. GRB 070126, Swift-BAT refined analysis of a very faint burst
  14. GRB070125: Optical observation by Kanata
  15. GRB070124: Swift-XRT Observation
  16. Possible GRB 070126: Swift/UVOT Upper Limit
  17. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  18. GRB 070125: Continued P60 Observations
  19. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  20. GRB 070125: Lick 3m Spectroscopy
  21. GRB070125: Swift-XRT Refined Analysis
  22. GRB 070125: SARA detection in R
  23. GRB 070125: P60 Optical Afterglow Candidate
  24. RHESSI Spectrum of GRB070125
  25. Konus-Wind observation of short hard GRB 070124
  26. GRB 070110: optical break
  27. Swift-BAT trigger 257213 is a Galactic Center transient
  28. GRB 070110: Continued Detection and Request for Ground Followup
  29. GRB 070110: Ep,i - Eiso correlation
  30. GRB 070107: Suzaku WAM observation of the prompt emission
  31. GRB 070110: VLT R-band photometry
  32. GRB 070110 declared a "Burst of Interest" by Swift team
  33. Further Retractions of previous Swift-BAT triggers
  34. GRB 070110: VLT absorption redshift
  35. GRB 070110: UVOT Observations of a Candidate Afterglow
  36. GRB070110: Swift XRT Team refined analysis
  37. GRB 070110, Swift-BAT refined analysis
  38. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  39. GRB070107: Swift/XRT refined analysis
  40. GRB 070107: Possible UVOT Afterglow
  41. GRB 070107, Swift-BAT refined analysis
  42. GRB 070107: Swift/XRT position
  43. VLA observation of GRB 061222B
  44. VLA detection of GRB 061222A
  45. GRB070103: APO SPIcam i' and z' limits
  46. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  47. GRB070103: KPNO 4m+FLAMINGOS J limit
  48. GRB 070103: Swift/UVOT Upper limits
  49. GRB070103: Swift XRT refined analysis
  50. GRB 070103, Swift-BAT refined analysis
  51. GRB 070103: NOT observations
  52. Retractions of previous Swift-BAT triggers
  53. GRB061222a: optical observations
  54. Konus-Wind observation of GRB 061222A
  55. GRB 061210: Swift/XRT Astrometry Correction
  56. GRB 050826: MDM Redshift
  57. GRB 061222B: TAROT La Silla observatory early optical observations
  58. GRB 061218: TAROT La Silla observatory early optical observations
  59. GRB 061222A: MITSuME Akeno optical upper limits
  60. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  61. GRB 061222B: MITSuME Akeno optical upper limits
  62. GRB 061222A: Gemini Afterglow Candidate
  63. GRB 061222B, Swift-BAT refined analysis
  64. GRB061222A Swift/UVOT: Upper Limits
  65. GRB 061222B: Swift/UVOT Upper limits
  66. GRB 061222B: Observation with the KANATA 1.5m telescope
  67. GRB061222B: Swift-XRT Refined Analysis
  68. GRB 061222A: Observation with the KANATA 1.5m telescope
  69. GRB 061222B: BOOTES-IR optical observations
  70. GRB 061222B: SARA upper limit
  71. GRB 061222A: Swift-XRT refined analysis
  72. GRB 061217: Magellan host galaxy redshift
  73. GRB 061222A, Swift-BAT refined analysis
  74. GRB 061222B: REM NIR/optical observations
  75. GRB 061222b, SMARTS optical/IR afterglow observations
  76. GRB 061222B: TAROT La Silla observatory afterglow observation
  77. GRB 061222b: Magellan redshift
  78. GRB 061222B: Swift detection of a burst
  79. GRB 061222A: Prompt ROTSE-III Optical Limits
  80. GRB 061201: Magellan redshift of nearby galaxy
  81. GRB 061217: Confirmation of host candidate
  82. GRB 061217: Object ib GCN 5948 is a star
  83. GRB 061217: Extended object in the revised XRT error circle
  84. GRB 061217, Candidate host galaxy
  85. GRB 061217 - Swift/XRT position correction
  86. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  87. GRB 061201: Correction to GCN 5944
  88. GRB 061201: Magellan Redshift of nearby Abell cluster
  89. GRB 061218: TAROT La Silla observatory optical observations
  90. GRB 061217: TAROT Calern observatory optical observations
  91. GRB 061218: TORTOREM optical upper limits
  92. GRB 061218, Swift-BAT refined analysis
  93. GRB061217: VLT NIR observations
  94. GRB 061218, SMARTS optical/IR observations
  95. GRB 061218: REM prompt observations
  96. GRB 061217, SMARTS optical observations
  97. GRB061217: Swift/UVOT refined analysis.
  98. GRB 061217: optical observations at Calar Alto
  99. GRB061217 - Swift/XRT refined analysis
  100. GRB 061217, Further Swift-BAT refined analysis of the short hard 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