Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

5073 results found.

  1. GRB 070411: Optical observations at Crni Vrh
  2. GRB 070411: Swift detection of a burst with optical afterglow
  3. GRB 070406: Swift XRT team further analysis
  4. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  5. GRB 070328: Suzaku WAM observation of the prompt emission
  6. GRB 070330, SMARTS optical/IR observations
  7. GRB 070330: TAROT La Silla observatory optical observations
  8. Konus-Wind observation of GRB 070328
  9. GRB 070328: Swift detection of a burst
  10. GRB 070311, deep optical photometry
  11. Short-Hard GRB 070209: PROMPT Observations
  12. GRB 070318: Swift detection of a burst with an optical afterglow
  13. GRB 070311: Optical Brightening
  14. GRB 070311: MDM Optical Follow-up
  15. GRB 070311: MDM Optical Detection
  16. GRB 070311: MITSuME Okayama Optical Observation
  17. GRB 070311: Swift-XRT refined analysis
  18. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  19. GRB 070311: REM candidate afterglow
  20. GRB 070309: A long GRB detected by INTEGRAL
  21. GRB 920925C: optical afterglow candidate
  22. GRB 070220: ART-3 Optical and NIR limits
  23. GRB 070219: ROTSE-III Optical Limits
  24. GRB 070209: Swift XRT analysis
  25. IPN localization of very bright long hard GRB 070207
  26. GRB 070209: Swift detection of a short hard burst
  27. GRB070124: Swift-XRT Follow-up Observation
  28. GRB070126: Swift-XRT Observation
  29. GRB 070125: MITSuME Okayama optical observation
  30. GRB070124: Swift-XRT Observation
  31. GRB 070110: VLT R-band photometry
  32. Further Retractions of previous Swift-BAT triggers
  33. Retractions of previous Swift-BAT triggers
  34. Konus-Wind observation of GRB 061222A
  35. GRB 061222A: Prompt ROTSE-III Optical Limits
  36. GRB 061222: Swift detection of a burst
  37. GRB 061218: TORTOREM optical upper limits
  38. GRB 061217: REM prompt observations
  39. GRB 061217: ROTSE-III Optical Limits
  40. GRB 061217: Swift detection of a short hard burst
  41. GRB 061210: MDM Follow-up Observation
  42. Swift-BAT triggers 238544 and 238546 are not GRBs
  43. GRB 061102: Swift detection of a burst
  44. GRB 061025: Gemini-S observations
  45. GRB061007: Swift UVOT followup observations
  46. GRB 061007: Magellan Spectroscopy
  47. GRB 061007: Swift XRT refined analysis
  48. GRB 061007 - FTS early brightening and power law decay
  49. GRB 061007: Swift detection of a burst with an optical counterpart
  50. GRB 061007: ROTSE-III Detection of Optical Counterpart
  51. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  52. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  53. GRB 061002: Swift detection of a burst
  54. GRB 060923C: VLT J-band observations
  55. GRB 060923C: Keck Observations
  56. GRB 060912A: Probable Host Galaxy
  57. GRB060904b optical detections (delayed report due to internet outage)
  58. GRB 060904B: RTT150 optical observations
  59. GRB 060904B: Optical observations at Crni Vrh
  60. GRB 060904B BOOTES-IR and 1.5m OSN observations
  61. GRB060904B - SDSS Pre-Burst Observations
  62. GRB 060904: TAROT optical observations
  63. GRB 060904B: Swift detection of a burst with optical counterpart
  64. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  65. GRB 060904: Swift detection of a bright burst
  66. GRB060901: Optical observations
  67. Two bright bursts from SGR 1806-20 detected with IBAS
  68. GRB060825: BOOTES-IR optical observations
  69. GRB 060825: Swift detection of a burst
  70. GRB 060729, SMARTS optical/IR observations
  71. GRB 060814: P200 NIR Observations
  72. GRB 060814: Swift detection of a bright burst
  73. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  74. GRB060807: Optical limiting magnitudes
  75. VLA Upper Limit on Outburst of SGR 1806-20
  76. GRB 060801, optical observation
  77. GRB 060801: Swift detection of a short burst
  78. Swift-BAT trigger 221873 is not a GRB or a Transient
  79. GRB060712: MASTER optical observation
  80. GRB120706: MASTER optical observation
  81. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  82. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  83. GRB060512: near IR observations
  84. GRB 060610: KAIT observations
  85. GRB 070706B: Watcher upper limit
  86. GRB060602A: Swift/UVOT upper limits
  87. GRB 060605: RTT150 optical observations
  88. GRB 060605: Swift-XRT Team refined analysis
  89. GRB 060605: RTT150 optical observations
  90. GRB 060605: Swift detection of a burst with optical counterpart
  91. GRB 060605: ROTSE-III Detection of Optical Counterpart
  92. GRB060502b: optical observations
  93. GRB 060526: REM observations
  94. GRB 060526: MDM-2.4m Observations
  95. GRB 060515: Super-LOTIS Observations
  96. GRB 060515: Swift detection of a burst
  97. GRB 060512: P60 Observations
  98. GRB060512 - SDSS Pre-Burst Observations
  99. GRB060512 Name Correction: LT Afterglow detection
  100. GRB060512: Liverpool Telescope Afterglow detection

Advanced

Download all Circulars as a .tar.gz archive:
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