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"

28260 results found.

  1. GRB 070125: optical observation
  2. GRB 070129, Swift-BAT refined analysis of a particularly long
  3. GRB 070129: Xinglong TNT optical Upper Limit
  4. GRB 070129: Swift-XRT Refined Analysis
  5. GRB 070129: VLT observations
  6. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  7. GRB 070129: Swift detection of a burst
  8. GRB 070126: Swift/UVOT refined analysis
  9. GRB 070125: MITSuME Okayama optical observation
  10. GRB 070125: optical observations
  11. GRB 070126: VLT observations
  12. GRB 070124: Suzaku WAM observation of the prompt emissions
  13. GRB 070125: UVOT Detection in Ultraviolet Filters
  14. GRB 070126, Swift-BAT refined analysis of a very faint burst
  15. GRB070125: Optical observation by Kanata
  16. GRB070124: Swift-XRT Observation
  17. Possible GRB 070126: Swift/UVOT Upper Limit
  18. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  19. GRB 070125: Xinglong TNT optical observations
  20. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  21. GRB 070125: Lick 3m Spectroscopy
  22. GRB070125: Swift-XRT Refined Analysis
  23. GRB 070125: SARA detection in R
  24. GRB 070125: P60 Optical Afterglow Candidate
  25. GRB 070126?: Swift detection of a possible burst
  26. GRB070125 redshift request
  27. IPN localization of GRB070124 (short duration, hard spectrum)
  28. GRB 070110: Ep,i - Eiso correlation
  29. GRB 070107: Suzaku WAM observation of the prompt emission
  30. GRB070110: Swift XRT Team refined analysis
  31. GRB 070110, Swift-BAT refined analysis
  32. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  33. GRB 070110: Swift detection of a burst with a possible optical afterglow
  34. GRB 070107: Possible UVOT Afterglow
  35. GRB 070107, Swift-BAT refined analysis
  36. GRB 070107: Swift detection of a burst
  37. VLA observation of GRB 061222B
  38. VLA detection of GRB 061222A
  39. GRB070103: APO SPIcam i' and z' limits
  40. GRB070103: KPNO 4m+FLAMINGOS J limit
  41. GRB 070103: Swift/UVOT Upper limits
  42. GRB070103: Swift XRT refined analysis
  43. GRB 070103, Swift-BAT refined analysis
  44. GRB 070103: NOT observations
  45. GRB 070103: TAROT Calern observatory optical observations
  46. Retractions of previous Swift-BAT triggers
  47. erratum : SDSS Pre-burst Observations of GRB061126
  48. GRB 061210: Swift/XRT Astrometry Correction
  49. GRB 050826: MDM Redshift
  50. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  51. GRB 061222A: Xinglong Optical Limit
  52. GRB 061222A: Gemini Afterglow Candidate
  53. GRB 061222B, Swift-BAT refined analysis
  54. GRB061222A Swift/UVOT: Upper Limits
  55. GRB 061222B: Swift/UVOT Upper limits
  56. GRB 061222B: Observation with the KANATA 1.5m telescope
  57. GRB 061222A: Observation with the KANATA 1.5m telescope
  58. GRB 061222B: BOOTES-IR optical observations
  59. GRB 061222B: SARA upper limit
  60. GRB 061217: Magellan host galaxy redshift
  61. GRB 061222A, Swift-BAT refined analysis
  62. GRB 061222B: REM NIR/optical observations
  63. GRB 061222B: TAROT La Silla observatory optical observations
  64. GRB 061222B: Swift detection of a burst
  65. GRB 061222b: optical afterglow
  66. GRB 061222A: Prompt ROTSE-III Optical Limits
  67. GRB 061222: Swift detection of a burst
  68. GRB 061218: TAROT La Silla observatory optical observations
  69. GRB 061217: TAROT Calern observatory optical observations
  70. GRB 061218: TORTOREM optical upper limits
  71. GRB 061218, Swift-BAT refined analysis
  72. GRB061217: VLT NIR observations
  73. GRB 061218, SMARTS optical/IR observations
  74. GRB 061218: REM prompt observations
  75. Swift triggers (#251863) on a possible burst
  76. GRB061217: Swift/UVOT refined analysis.
  77. GRB 061217: optical observations at Calar Alto
  78. GRB061217 - Swift/XRT refined analysis
  79. GRB 061217, Swift-BAT refined analysis
  80. GRB 061217: Magellan Observations
  81. GRB 061217: REM prompt observations
  82. GRB 061217: ROTSE-III Optical Limits
  83. GRB061210: Swift/UVOT observations
  84. GRB 061210: Swift XRT analysis - Possible counterparts
  85. GRB 061210: Gemini/GMOS Observations
  86. GRB 061126: Radio Observations
  87. GRB061210: Radio Observations
  88. GRB 061202: Suzaku WAM observation of the prompt emission
  89. GRB 061210, Swift-BAT refined analysis of the SHB
  90. Optical Afterglow observations of GRB 061126
  91. GRB 060926: MASTER: discovery of the optical flare
  92. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  93. GRB 061202: TORTOREM optical upper limits
  94. GRB 061201: VLT optical decay
  95. GRB 061201: SOAR Confirmation of Candidate Afterglow
  96. GRB061202: FRAM early follow-up limit
  97. GRB061202 optical limit by "Pi of the Sky"
  98. GRB061202: optical/NIR observations with REM
  99. GRB061202: Swift/UVOT Upper Limits
  100. GRB 061202, Swift-BAT refined analysis

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