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"

16181 results found.

  1. GRB 130420A: Weihai Optical Observations
  2. GRB 130420B: MASTER-Net optical observations
  3. GRB 130420A: T21 optical observations
  4. GRB 130420A: RATIR Optical and NIR Observations
  5. GRB 130420A: PAIRITEL NIR detections
  6. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  7. GRB 130420A: Swift detection of a burst with an optical counterpart
  8. GRB 130418A: Continued RATIR Optical and NIR Observations
  9. GRB 130418A: SMARTS optical/IR afterglow observations
  10. GRB 130418A: Submm observations from SMA
  11. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  12. Trigger 553930: Swift detection of a possible flare from HR 5110
  13. GRB 130418A: T21 optical observation
  14. GRB 130418A: T18 and T21 optical observations
  15. GRB 130418A: LOAO Observation
  16. GRB 130418A, Swift-BAT refined analysis
  17. GRB130418A: VLT/X-shooter redshift confirmation
  18. GRB 130418A: REM NIR observations
  19. GRB 130418A: RATIR Optical and NIR Observations
  20. GRB 130418A: CARMA 3mm detection
  21. GRB 130418A: GROND detection of the optical-NIR afterglow
  22. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  23. GRB 130418A: TNG optical observations
  24. GRB 130418A: Bassano Bresciano Observatory optical observations
  25. GRB 130418A: 1.23m I-band observations
  26. GRB 130418A: Swift detection of a burst with an optical counterpart
  27. GRB 130408a: Skynet Optical Observations
  28. GRB 130408A: SMARTS optical/IR afterglow observations
  29. GRB 130408A: Zadko observatory - Gingin optical observations
  30. GRB 130408A: GROND detection of the afterglow
  31. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  32. GRB 130408A: Liverpool Telescope Optical candidate detection
  33. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  34. GRB 130327A: Weihai optical obsevations
  35. GRB 130327A: Swift/UVOT Upper Limits
  36. GRB 130327A: ISON-NM optical upper limit
  37. GRB 130327A: RATIR Optical and NIR Observations
  38. report: GRB 130315A: Zadko observatory - Gingin optical observations
  39. GRB 130305A: optical upper limit in Mondy observatory
  40. GRB 130313A: optical upper limit in CrAO
  41. GRB 130313A: optical upper limit in Mondy observatory
  42. GRB 130315A: SALT optical observations
  43. GRB130313A: GTC early optical limits
  44. GRB 130313A: 5.8 GHz VLA upper limit
  45. GRB 130313A: Swift/UVOT Upper Limits
  46. GRB 130305A: PTF P48 optical upper limits
  47. GRB130315A BOOTES-3 optical limit
  48. GRB 130313A: RATIR Optical and NIR Observations
  49. GRB 130313A: TNG optical observations
  50. GRB 130215A: Detection of the SN with the 10.4m GTC
  51. GRB130313A: Optical observations from GTC
  52. GRB 130313A: NOT optical upper limit
  53. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  54. GRB 130313A: Weihai optical upper limit
  55. GRB 130313A: Zadko observatory - Gingin optical observations
  56. GRB 130313A: MASTER-Net optical observations
  57. GRB 130310A: optical observations
  58. GRB 130306A: Swift Detection of a Possible Afterglow
  59. GRB 130306A: MITSuME Ishigakijima upper limits
  60. GRB 130305A: Optical Observations
  61. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  62. GRB 130306A: MASTER-Net pre-Swift alert observation
  63. GRB 130305A: Swift/UVOT Upper Limit
  64. GRB 121128A: optical observations in Mondy observatory
  65. GRB 121128A: optical upper limit in Maidanak observatory
  66. Trigger 549841: Swift detection of SGR1806-20
  67. GRB 130215A: PTF P48 optical detection
  68. GRB 130216B: MASTER-Net early observation
  69. GRB 130216A: MASTER-Net early observations
  70. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  71. GRB 130216A: MITSuME Ishigakijima upper limits
  72. GRB 130216A: TAROT La Silla observatory optical observations
  73. GRB 130216A: OSN I-band observations
  74. GRB 130215A: P200 NIR observations
  75. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  76. GRB 130215A: MITSuME Okayama Optical Observation
  77. GRB 130215A: RAPTOR Measurements
  78. GRB 130215A: GMG optical observation
  79. GRB 130215A: iTelescope T11 observations
  80. GRB 130215A: Xinglong optical observations
  81. GRB 130215A: TAROT La Silla observatory optical observations
  82. GRB 130215A: RATIR Optical and NIR Observations
  83. GRB 130215A: REM NIR observations
  84. GRB 130215A: CARMA 3mm detection
  85. GRB 130215A: P60 Observations
  86. GRB 130215A: Redshift estimate
  87. GRB 130215: ROTSE-III Detection of Optical Counterpart
  88. GRB 130131B: CTIO 0.9-m optical upper-limits
  89. GRB 121128A: optical observations
  90. GRB 121123A: optical observations
  91. GRB 130211A: Swift/UVOT Upper Limits
  92. GRB 130131A: MITSuME Akeno Optical upper limits
  93. GRB 130131B: MITSuME Akeno Optical upper limits
  94. GRB 130122A: PTF P48 optical upper limits
  95. GRB 130206A: XRT and UVOT follow-up observations.
  96. GRB 130131B: optical upper limit in Mondy observatory
  97. GRB 130206A: Zadko observatory - Gingin optical observations
  98. GRB 130131A: optical observation in Mondy observatory
  99. GRB 130131A: Swift/UVOT Upper Limits
  100. GRB 130131A: RATIR optical and infrared upper limits

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